Actually use the Jekyll SEO plugin

It was being duplicated because I forgot to remove the old title and
description etc first and I added a description to the welcome post
since otherwise it'll use the site wide description. Also updated the
config to create excerpts automatically.

Author: sondr3

generators/jekyll/templates/app/_includes/head.html

@@ -3,9 +3,8 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge">
   <meta name="viewport" content="width=device-width, initial-scale=1">
 
-  <title>{% if page.title %}{{ page.title | escape }}{% else %}{{ site.title | escape }}{% endif %}</title>
-  <meta name="description" content="{% if page.excerpt %}{{ page.excerpt | strip_html | strip_newlines | truncate: 160 }}{% else %}{{ site.description }}{% endif %}">
-  <link rel="canonical" href="{{ page.url | replace:'index.html','' | prepend: site.baseurl | prepend: site.url }}">
+  <!-- SEO -->
+  {% seo %}
 
   <!-- CSS -->
   <!-- inject:css -->
@@ -17,7 +16,4 @@
 
   <!-- RSS -->
   {% feed_meta %}
-
-  <!-- SEO -->
-  {% seo %}
 </head>

generators/jekyll/templates/app/_posts/2014-03-03-welcome-to-jekyll.md

@@ -2,6 +2,7 @@
 layout: post
 date: 2015-02-03
 title:  Welcome to Jekyll!
+description: A post welcoming you to Jekyll
 categories: jekyll
 ---
 

generators/jekyll/templates/config.yml

@@ -33,7 +33,7 @@ limit_posts: 10
 permalink: <%= jekyllPermalinks %>
 paginate: 10
 paginate_path: 'page:num'
-excerpt_separator: '<!--more-->'
+excerpt_separator: ''
 
 # Markdown library and options
 markdown: redcarpet