Fix linking to blog articles from index.

static/blog_index.tmpl.html

@@ -30,7 +30,7 @@
         {% for post in posts %}
         <div class="post-container">
           <article class="post">
-            <h2 class="post-title">{{ post.title }}</h2>
+            <h2 class="post-title"><a href="{{ post.link }}">{{ post.title }}</a></h2>
             <div class="post-metadata">
               <time datetime="{{ post.post_publication_date }}">
                 {{ post.post_publication_date }}