move to a consistent post listing format

blog/index.html

@@ -8,8 +8,5 @@ title: Blog Archive
   {% assign year = this_year %}
   <h3>{{ year }}</h3>
 {% endunless %}
-<div>
-  <time datetime="{{ post.date | datetime | date_to_xmlschema }}" pubdate>{{ post.date | date: "%B %d" }}</time> &mdash;
-  <a href="/{{ post.url }}">{{post.title}}</a>
-</div>
+{% include article_list.html %}
 {% endfor %}