Group articles by year, remove publish dates (visual noise)

_config.yml

@@ -2,7 +2,7 @@ title:            Minimal Mistakes
 tagline:          Jekyll Theme
 description:      A responsive Jekyll theme with editorial design tendencies.
 #Comment out url when working locally to resolve base urls correctly
-url:              http://mmistakes.github.io/minimal-mistakes
+#url:              http://mmistakes.github.io/minimal-mistakes
 
 # Owner/author information goes here.
 owner:

_layouts/post-index.html

@@ -27,11 +27,21 @@
 
 <div id="index" itemprop="mainContentOfPage" itemscope itemtype="http://schema.org/Blog">
   {% for post in site.posts %}  
-  <article itemscope itemtype="http://schema.org/BlogPosting" itemprop="blogPost">
-    <h2 itemprop="headline"><a href="{{ site.url }}{{ post.url }}" rel="bookmark" title="{{ post.title }}">{{ post.title }}</a></h2>
-    <p class="byline"><time datetime="{{ post.date | date_to_xmlschema }}" itemprop="datePublished">{{ post.date | date: "%B %d, %Y" }}</time></p>
-    <p itemprop="text">{% if post.description %}{{ post.description }}{% else %}{{ post.content | strip_html | strip_newlines | truncate: 120 }}{% endif %}</p>
-  </article>
+  {% unless post.next %}
+    <h3>{{ post.date | date: '%Y' }}</h3>
+    <hr />
+    {% else %}
+      {% capture year %}{{ post.date | date: '%Y' }}{% endcapture %}
+      {% capture nyear %}{{ post.next.date | date: '%Y' }}{% endcapture %}
+      {% if year != nyear %}
+        <h3>{{ post.date | date: '%Y' }}</h3>
+        <hr />
+      {% endif %}
+    {% endunless %}
+    <article itemscope itemtype="http://schema.org/BlogPosting" itemprop="blogPost">
+      <h2 itemprop="headline"><a href="{{ site.url }}{{ post.url }}" rel="bookmark" title="{{ post.title }}">{{ post.title }}</a></h2>
+      <p itemprop="text">{% if post.description %}{{ post.description }}{% else %}{{ post.content | strip_html | strip_newlines | truncate: 120 }}{% endif %}</p>
+    </article>
   {% endfor %}
 </div><!-- /#index -->