Re-add Duncan Mac-Vicar (with new domain)

The previous domain no longer exists, therefore it was commented out
in af3a318

planet.ini

@@ -131,12 +131,12 @@ title = Planet openSUSE
   link     = https://blog.jimmac.eu/
   author   = irc:jimmac member
 
-#[duncanmacvicar]
-#  title    = Duncan Mac-Vicar
-#  feed     = https://duncan.codes/posts/rss.xml
-#  link     = https://duncan.codes
-#  avatar   = dmv.png
-#  author   = irc:duncanmv member
+[duncanmacvicar]
+  title    = Duncan Mac-Vicar
+  feed     = https://www.mac-vicar.eu/posts/posts/rss.xml
+  link     = https://www.mac-vicar.eu/posts/archive.html
+  avatar   = dmv.png
+  author   = irc:duncanmv member
 
 [willstephenson]
   title    = Will Stephenson