diff --git a/config.rb b/config.rb
index 5dd1ee507..b14ce2220 100644
--- a/config.rb
+++ b/config.rb
@@ -6,23 +6,21 @@
 I18n.config.enforce_available_locales = false
 
 activate :blog do |blog|
-  blog.name = 'blog'
+  blog.name   = 'blog'
 
   blog.permalink = 'blog/:title.html'
   blog.sources   = 'blog/articles/:title.html'
   blog.layout    = 'layouts/blog_layout'
-  blog.default_extension = '.markdown'
 
   blog.paginate = false
 end
 
 activate :blog do |forge|
-  forge.name = 'forge'
+  forge.name   = 'forge'
 
   forge.permalink = 'forge/:title.html'
   forge.sources   = 'forge/chapitres/:title.html'
   forge.layout    = 'layouts/forge_layout'
-  forge.default_extension = '.markdown'
 end
 
 ###
diff --git a/data/tree.yml b/data/tree.yml
index e01f8bf4a..c906da08d 100644
--- a/data/tree.yml
+++ b/data/tree.yml
@@ -3,85 +3,85 @@
 about.html.slim: "/about.html.slim"
 blog:
   articles:
-    2011-11-28-framework-php.markdown: "/blog/articles/2011-11-28-framework-php.markdown"
-    2011-12-05-declaration-autoentrepreneur.markdown: "/blog/articles/2011-12-05-declaration-autoentrepreneur.markdown"
-    2011-12-05-mesure-pixel.markdown: "/blog/articles/2011-12-05-mesure-pixel.markdown"
-    2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.markdown: "/blog/articles/2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.markdown"
-    2012-01-11-afficher-masquer-la-grille-des-pixels-en-zoom-photoshop.markdown: "/blog/articles/2012-01-11-afficher-masquer-la-grille-des-pixels-en-zoom-photoshop.markdown"
-    2012-03-16-webdesign-adaptatif-5-astuces-indispensables.markdown: "/blog/articles/2012-03-16-webdesign-adaptatif-5-astuces-indispensables.markdown"
-    2012-06-08-windows-repertoire-git.markdown: "/blog/articles/2012-06-08-windows-repertoire-git.markdown"
-    2012-06-22-integration-emails.markdown: "/blog/articles/2012-06-22-integration-emails.markdown"
-    2012-07-02-favicon.markdown: "/blog/articles/2012-07-02-favicon.markdown"
-    2012-07-13-igoogle-xml-opml.markdown: "/blog/articles/2012-07-13-igoogle-xml-opml.markdown"
-    2012-07-31-creez-rapidement-votre-portfolio-en-6-etapes.markdown: "/blog/articles/2012-07-31-creez-rapidement-votre-portfolio-en-6-etapes.markdown"
-    2012-08-06-typographie-google-font.markdown: "/blog/articles/2012-08-06-typographie-google-font.markdown"
-    2012-08-10-prix-site-internet.html.markdown: "/blog/articles/2012-08-10-prix-site-internet.html.markdown"
-    2012-08-27-twitter-a-change-votre-vie-essayez-lift.markdown: "/blog/articles/2012-08-27-twitter-a-change-votre-vie-essayez-lift.markdown"
-    2012-10-16-question-wireframe.markdown: "/blog/articles/2012-10-16-question-wireframe.markdown"
-    2012-11-08-redaction-briefing.markdown: "/blog/articles/2012-11-08-redaction-briefing.markdown"
-    2012-11-21-banniere-application-mobile.markdown: "/blog/articles/2012-11-21-banniere-application-mobile.markdown"
-    2012-11-23-tarif-webdesigner.markdown: "/blog/articles/2012-11-23-tarif-webdesigner.markdown"
-    2012-12-08-open-du-web-lille.markdown: "/blog/articles/2012-12-08-open-du-web-lille.markdown"
-    2012-12-20-choix-lien-bouton.markdown: "/blog/articles/2012-12-20-choix-lien-bouton.markdown"
-    2013-01-09-formation-print-web.markdown: "/blog/articles/2013-01-09-formation-print-web.markdown"
-    2013-01-11-zendstudio-todo-installation.markdown: "/blog/articles/2013-01-11-zendstudio-todo-installation.markdown"
-    2013-01-23-takeoff-conf-2013.markdown: "/blog/articles/2013-01-23-takeoff-conf-2013.markdown"
-    2013-01-29-test-firefoxosappdays.markdown: "/blog/articles/2013-01-29-test-firefoxosappdays.markdown"
-    2013-02-25-webdesign-adaptatif-vs-site-mobile-vs-application-native.markdown: "/blog/articles/2013-02-25-webdesign-adaptatif-vs-site-mobile-vs-application-native.markdown"
-    2013-05-31-base-design-adaptatif.markdown: "/blog/articles/2013-05-31-base-design-adaptatif.markdown"
-    2013-06-14-css-evolutif.html.markdown: "/blog/articles/2013-06-14-css-evolutif.html.markdown"
-    2013-08-14-breakpoint.markdown: "/blog/articles/2013-08-14-breakpoint.markdown"
-    2013-08-16-hebergement-gratuit-ovh.markdown: "/blog/articles/2013-08-16-hebergement-gratuit-ovh.markdown"
-    2013-11-15-javascript.markdown: "/blog/articles/2013-11-15-javascript.markdown"
-    2013-11-26-esprit-web.markdown: "/blog/articles/2013-11-26-esprit-web.markdown"
-    2013-12-13-foundation-breakpoint.markdown: "/blog/articles/2013-12-13-foundation-breakpoint.markdown"
-    2014-01-08-briefing-creatif.markdown: "/blog/articles/2014-01-08-briefing-creatif.markdown"
-    2014-01-13-firefox-2014.markdown: "/blog/articles/2014-01-13-firefox-2014.markdown"
-    2014-01-17-favicon-middleman.markdown: "/blog/articles/2014-01-17-favicon-middleman.markdown"
-    2014-01-24-foundation5-interchange.markdown: "/blog/articles/2014-01-24-foundation5-interchange.markdown"
-    2014-01-28-foundation5-snippet.markdown: "/blog/articles/2014-01-28-foundation5-snippet.markdown"
-    2014-02-07-takeoff-conf-2014.markdown: "/blog/articles/2014-02-07-takeoff-conf-2014.markdown"
-    2014-02-11-foundation5-architecture-interchange.markdown: "/blog/articles/2014-02-11-foundation5-architecture-interchange.markdown"
-    2014-02-20-client-idiot.markdown: "/blog/articles/2014-02-20-client-idiot.markdown"
-    2014-02-25-fin-psd.markdown: "/blog/articles/2014-02-25-fin-psd.markdown"
-    2014-03-31-conseil-dev.markdown: "/blog/articles/2014-03-31-conseil-dev.markdown"
-    2014-04-01-easter-egg-april.markdown: "/blog/articles/2014-04-01-easter-egg-april.markdown"
-    2014-04-02-louvrelens.markdown: "/blog/articles/2014-04-02-louvrelens.markdown"
-    2014-04-14-migration-wordpress.markdown: "/blog/articles/2014-04-14-migration-wordpress.markdown"
-    2014-05-21-site-obese.markdown: "/blog/articles/2014-05-21-site-obese.markdown"
-    2014-05-27-import-sass.markdown: "/blog/articles/2014-05-27-import-sass.markdown"
-    2014-07-30-grille-semantique.markdown: "/blog/articles/2014-07-30-grille-semantique.markdown"
-    2014-08-03-metier-integrateur-web.markdown: "/blog/articles/2014-08-03-metier-integrateur-web.markdown"
-    2014-08-06-github-ninja.markdown: "/blog/articles/2014-08-06-github-ninja.markdown"
-    2014-08-18-foundation-love.markdown: "/blog/articles/2014-08-18-foundation-love.markdown"
-    2014-08-24-guide-sublime-text.markdown: "/blog/articles/2014-08-24-guide-sublime-text.markdown"
-    2014-09-07-template-ruby.markdown: "/blog/articles/2014-09-07-template-ruby.markdown"
-    2014-09-23-paris-web-2014.markdown: "/blog/articles/2014-09-23-paris-web-2014.markdown"
-    2014-12-21-conseils-sketchnoting.markdown: "/blog/articles/2014-12-21-conseils-sketchnoting.markdown"
-    2015-02-01-fosdem-2015.markdown: "/blog/articles/2015-02-01-fosdem-2015.markdown"
-    2015-02-27-foundation-mixin.markdown: "/blog/articles/2015-02-27-foundation-mixin.markdown"
-    2015-02-27-grille-impair-centre.markdown: "/blog/articles/2015-02-27-grille-impair-centre.markdown"
-    2015-04-23-sublime-package.markdown: "/blog/articles/2015-04-23-sublime-package.markdown"
-    2015-06-08-outil-analyse-front-end.markdown: "/blog/articles/2015-06-08-outil-analyse-front-end.markdown"
-    2015-06-25-webperf.markdown: "/blog/articles/2015-06-25-webperf.markdown"
-    2015-07-01-typography-sass.markdown: "/blog/articles/2015-07-01-typography-sass.markdown"
-    2015-07-20-wireframe-font.markdown: "/blog/articles/2015-07-20-wireframe-font.markdown"
-    2015-08-26-truncate.markdown: "/blog/articles/2015-08-26-truncate.markdown"
-    2015-09-21-365-jours-de-code.markdown: "/blog/articles/2015-09-21-365-jours-de-code.markdown"
-    2015-10-03-paris-web-2015.markdown: "/blog/articles/2015-10-03-paris-web-2015.markdown"
-    2015-10-06-offthegrid.markdown: "/blog/articles/2015-10-06-offthegrid.markdown"
-    2016-02-08-online.markdown: "/blog/articles/2016-02-08-online.markdown"
-    2016-02-14-openclassroom-integrateur-web.markdown: "/blog/articles/2016-02-14-openclassroom-integrateur-web.markdown"
-    2016-03-04-svg-helper-ruby.markdown: "/blog/articles/2016-03-04-svg-helper-ruby.markdown"
-    2016-03-10-mobile-first-webdesign.markdown: "/blog/articles/2016-03-10-mobile-first-webdesign.markdown"
-    2016-03-25-takeoffconf-code-promo.markdown: "/blog/articles/2016-03-25-takeoffconf-code-promo.markdown"
-    2016-03-29-npm-init-config.markdown: "/blog/articles/2016-03-29-npm-init-config.markdown"
-    2016-05-04-gitshot.markdown: "/blog/articles/2016-05-04-gitshot.markdown"
-    2016-06-14-certification-google.markdown: "/blog/articles/2016-06-14-certification-google.markdown"
-    2016-12-11-indonesia.markdown: "/blog/articles/2016-12-11-indonesia.markdown"
-    2017-02-06-fosdem-2017.markdown: "/blog/articles/2017-02-06-fosdem-2017.markdown"
-    2017-03-13-jamstack.markdown: "/blog/articles/2017-03-13-jamstack.markdown"
-    2017-05-11-atom.markdown: "/blog/articles/2017-05-11-atom.markdown"
+    2011-11-28-framework-php.html.md: "/blog/articles/2011-11-28-framework-php.html.md"
+    2011-12-05-declaration-autoentrepreneur.html.md: "/blog/articles/2011-12-05-declaration-autoentrepreneur.html.md"
+    2011-12-05-mesure-pixel.html.md: "/blog/articles/2011-12-05-mesure-pixel.html.md"
+    2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.html.md: "/blog/articles/2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.html.md"
+    2012-01-11-afficher-masquer-la-grille-des-pixels-en-zoom-photoshop.html.md: "/blog/articles/2012-01-11-afficher-masquer-la-grille-des-pixels-en-zoom-photoshop.html.md"
+    2012-03-16-webdesign-adaptatif-5-astuces-indispensables.html.md: "/blog/articles/2012-03-16-webdesign-adaptatif-5-astuces-indispensables.html.md"
+    2012-06-08-windows-repertoire-git.html.md: "/blog/articles/2012-06-08-windows-repertoire-git.html.md"
+    2012-06-22-integration-emails.html.md: "/blog/articles/2012-06-22-integration-emails.html.md"
+    2012-07-02-favicon.html.md: "/blog/articles/2012-07-02-favicon.html.md"
+    2012-07-13-igoogle-xml-opml.html.md: "/blog/articles/2012-07-13-igoogle-xml-opml.html.md"
+    2012-07-31-creez-rapidement-votre-portfolio-en-6-etapes.html.md: "/blog/articles/2012-07-31-creez-rapidement-votre-portfolio-en-6-etapes.html.md"
+    2012-08-06-typographie-google-font.html.md: "/blog/articles/2012-08-06-typographie-google-font.html.md"
+    2012-08-10-prix-site-internet.html.html.md: "/blog/articles/2012-08-10-prix-site-internet.html.html.md"
+    2012-08-27-twitter-a-change-votre-vie-essayez-lift.html.md: "/blog/articles/2012-08-27-twitter-a-change-votre-vie-essayez-lift.html.md"
+    2012-10-16-question-wireframe.html.md: "/blog/articles/2012-10-16-question-wireframe.html.md"
+    2012-11-08-redaction-briefing.html.md: "/blog/articles/2012-11-08-redaction-briefing.html.md"
+    2012-11-21-banniere-application-mobile.html.md: "/blog/articles/2012-11-21-banniere-application-mobile.html.md"
+    2012-11-23-tarif-webdesigner.html.md: "/blog/articles/2012-11-23-tarif-webdesigner.html.md"
+    2012-12-08-open-du-web-lille.html.md: "/blog/articles/2012-12-08-open-du-web-lille.html.md"
+    2012-12-20-choix-lien-bouton.html.md: "/blog/articles/2012-12-20-choix-lien-bouton.html.md"
+    2013-01-09-formation-print-web.html.md: "/blog/articles/2013-01-09-formation-print-web.html.md"
+    2013-01-11-zendstudio-todo-installation.html.md: "/blog/articles/2013-01-11-zendstudio-todo-installation.html.md"
+    2013-01-23-takeoff-conf-2013.html.md: "/blog/articles/2013-01-23-takeoff-conf-2013.html.md"
+    2013-01-29-test-firefoxosappdays.html.md: "/blog/articles/2013-01-29-test-firefoxosappdays.html.md"
+    2013-02-25-webdesign-adaptatif-vs-site-mobile-vs-application-native.html.md: "/blog/articles/2013-02-25-webdesign-adaptatif-vs-site-mobile-vs-application-native.html.md"
+    2013-05-31-base-design-adaptatif.html.md: "/blog/articles/2013-05-31-base-design-adaptatif.html.md"
+    2013-06-14-css-evolutif.html.html.md: "/blog/articles/2013-06-14-css-evolutif.html.html.md"
+    2013-08-14-breakpoint.html.md: "/blog/articles/2013-08-14-breakpoint.html.md"
+    2013-08-16-hebergement-gratuit-ovh.html.md: "/blog/articles/2013-08-16-hebergement-gratuit-ovh.html.md"
+    2013-11-15-javascript.html.md: "/blog/articles/2013-11-15-javascript.html.md"
+    2013-11-26-esprit-web.html.md: "/blog/articles/2013-11-26-esprit-web.html.md"
+    2013-12-13-foundation-breakpoint.html.md: "/blog/articles/2013-12-13-foundation-breakpoint.html.md"
+    2014-01-08-briefing-creatif.html.md: "/blog/articles/2014-01-08-briefing-creatif.html.md"
+    2014-01-13-firefox-2014.html.md: "/blog/articles/2014-01-13-firefox-2014.html.md"
+    2014-01-17-favicon-middleman.html.md: "/blog/articles/2014-01-17-favicon-middleman.html.md"
+    2014-01-24-foundation5-interchange.html.md: "/blog/articles/2014-01-24-foundation5-interchange.html.md"
+    2014-01-28-foundation5-snippet.html.md: "/blog/articles/2014-01-28-foundation5-snippet.html.md"
+    2014-02-07-takeoff-conf-2014.html.md: "/blog/articles/2014-02-07-takeoff-conf-2014.html.md"
+    2014-02-11-foundation5-architecture-interchange.html.md: "/blog/articles/2014-02-11-foundation5-architecture-interchange.html.md"
+    2014-02-20-client-idiot.html.md: "/blog/articles/2014-02-20-client-idiot.html.md"
+    2014-02-25-fin-psd.html.md: "/blog/articles/2014-02-25-fin-psd.html.md"
+    2014-03-31-conseil-dev.html.md: "/blog/articles/2014-03-31-conseil-dev.html.md"
+    2014-04-01-easter-egg-april.html.md: "/blog/articles/2014-04-01-easter-egg-april.html.md"
+    2014-04-02-louvrelens.html.md: "/blog/articles/2014-04-02-louvrelens.html.md"
+    2014-04-14-migration-wordpress.html.md: "/blog/articles/2014-04-14-migration-wordpress.html.md"
+    2014-05-21-site-obese.html.md: "/blog/articles/2014-05-21-site-obese.html.md"
+    2014-05-27-import-sass.html.md: "/blog/articles/2014-05-27-import-sass.html.md"
+    2014-07-30-grille-semantique.html.md: "/blog/articles/2014-07-30-grille-semantique.html.md"
+    2014-08-03-metier-integrateur-web.html.md: "/blog/articles/2014-08-03-metier-integrateur-web.html.md"
+    2014-08-06-github-ninja.html.md: "/blog/articles/2014-08-06-github-ninja.html.md"
+    2014-08-18-foundation-love.html.md: "/blog/articles/2014-08-18-foundation-love.html.md"
+    2014-08-24-guide-sublime-text.html.md: "/blog/articles/2014-08-24-guide-sublime-text.html.md"
+    2014-09-07-template-ruby.html.md: "/blog/articles/2014-09-07-template-ruby.html.md"
+    2014-09-23-paris-web-2014.html.md: "/blog/articles/2014-09-23-paris-web-2014.html.md"
+    2014-12-21-conseils-sketchnoting.html.md: "/blog/articles/2014-12-21-conseils-sketchnoting.html.md"
+    2015-02-01-fosdem-2015.html.md: "/blog/articles/2015-02-01-fosdem-2015.html.md"
+    2015-02-27-foundation-mixin.html.md: "/blog/articles/2015-02-27-foundation-mixin.html.md"
+    2015-02-27-grille-impair-centre.html.md: "/blog/articles/2015-02-27-grille-impair-centre.html.md"
+    2015-04-23-sublime-package.html.md: "/blog/articles/2015-04-23-sublime-package.html.md"
+    2015-06-08-outil-analyse-front-end.html.md: "/blog/articles/2015-06-08-outil-analyse-front-end.html.md"
+    2015-06-25-webperf.html.md: "/blog/articles/2015-06-25-webperf.html.md"
+    2015-07-01-typography-sass.html.md: "/blog/articles/2015-07-01-typography-sass.html.md"
+    2015-07-20-wireframe-font.html.md: "/blog/articles/2015-07-20-wireframe-font.html.md"
+    2015-08-26-truncate.html.md: "/blog/articles/2015-08-26-truncate.html.md"
+    2015-09-21-365-jours-de-code.html.md: "/blog/articles/2015-09-21-365-jours-de-code.html.md"
+    2015-10-03-paris-web-2015.html.md: "/blog/articles/2015-10-03-paris-web-2015.html.md"
+    2015-10-06-offthegrid.html.md: "/blog/articles/2015-10-06-offthegrid.html.md"
+    2016-02-08-online.html.md: "/blog/articles/2016-02-08-online.html.md"
+    2016-02-14-openclassroom-integrateur-web.html.md: "/blog/articles/2016-02-14-openclassroom-integrateur-web.html.md"
+    2016-03-04-svg-helper-ruby.html.md: "/blog/articles/2016-03-04-svg-helper-ruby.html.md"
+    2016-03-10-mobile-first-webdesign.html.md: "/blog/articles/2016-03-10-mobile-first-webdesign.html.md"
+    2016-03-25-takeoffconf-code-promo.html.md: "/blog/articles/2016-03-25-takeoffconf-code-promo.html.md"
+    2016-03-29-npm-init-config.html.md: "/blog/articles/2016-03-29-npm-init-config.html.md"
+    2016-05-04-gitshot.html.md: "/blog/articles/2016-05-04-gitshot.html.md"
+    2016-06-14-certification-google.html.md: "/blog/articles/2016-06-14-certification-google.html.md"
+    2016-12-11-indonesia.html.md: "/blog/articles/2016-12-11-indonesia.html.md"
+    2017-02-06-fosdem-2017.html.md: "/blog/articles/2017-02-06-fosdem-2017.html.md"
+    2017-03-13-jamstack.html.md: "/blog/articles/2017-03-13-jamstack.html.md"
+    2017-05-11-atom.html.md: "/blog/articles/2017-05-11-atom.html.md"
   index.html.slim: "/blog/index.html.slim"
 clients.html.slim: "/clients.html.slim"
 contact.html.slim: "/contact.html.slim"
@@ -97,13 +97,13 @@ dev:
   tools.html.slim: "/dev/tools.html.slim"
 forge:
   chapitres:
-    0-1-evolution.markdown: "/forge/chapitres/0-1-evolution.markdown"
-    1-1-technique.markdown: "/forge/chapitres/1-1-technique.markdown"
-    1-2-lecture.markdown: "/forge/chapitres/1-2-lecture.markdown"
-    1-3-architecture.markdown: "/forge/chapitres/1-3-architecture.markdown"
-    1-4-publicite.markdown: "/forge/chapitres/1-4-publicite.markdown"
-    1-5-details.markdown: "/forge/chapitres/1-5-details.markdown"
-    2-1-manifeste-refonte.markdown: "/forge/chapitres/2-1-manifeste-refonte.markdown"
+    0-1-evolution.html.md: "/forge/chapitres/0-1-evolution.html.md"
+    1-1-technique.html.md: "/forge/chapitres/1-1-technique.html.md"
+    1-2-lecture.html.md: "/forge/chapitres/1-2-lecture.html.md"
+    1-3-architecture.html.md: "/forge/chapitres/1-3-architecture.html.md"
+    1-4-publicite.html.md: "/forge/chapitres/1-4-publicite.html.md"
+    1-5-details.html.md: "/forge/chapitres/1-5-details.html.md"
+    2-1-manifeste-refonte.html.md: "/forge/chapitres/2-1-manifeste-refonte.html.md"
   index.html.slim: "/forge/index.html.slim"
 glossary.html.slim: "/glossary.html.slim"
 gnu.html.slim: "/gnu.html.slim"
diff --git a/source/blog/articles/2011-11-28-framework-php.markdown b/source/blog/articles/2011-11-28-framework-php.html.md
similarity index 100%
rename from source/blog/articles/2011-11-28-framework-php.markdown
rename to source/blog/articles/2011-11-28-framework-php.html.md
diff --git a/source/blog/articles/2011-12-05-declaration-autoentrepreneur.markdown b/source/blog/articles/2011-12-05-declaration-autoentrepreneur.html.md
similarity index 100%
rename from source/blog/articles/2011-12-05-declaration-autoentrepreneur.markdown
rename to source/blog/articles/2011-12-05-declaration-autoentrepreneur.html.md
diff --git a/source/blog/articles/2011-12-05-mesure-pixel.markdown b/source/blog/articles/2011-12-05-mesure-pixel.html.md
similarity index 100%
rename from source/blog/articles/2011-12-05-mesure-pixel.markdown
rename to source/blog/articles/2011-12-05-mesure-pixel.html.md
diff --git a/source/blog/articles/2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.markdown b/source/blog/articles/2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.html.md
similarity index 100%
rename from source/blog/articles/2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.markdown
rename to source/blog/articles/2011-12-27-liste-ultime-de-site-internet-pour-les-auto-entrepreneurs.html.md
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