Improve category handling. Remove top-bar navigation for now (may bring it back later, in a more customized fashion)

index.html

@@ -4,6 +4,7 @@ layout: default
 <div class="home">
   {% for category in site.categories %}
     {% if category.first == "meta" %} {% continue %} {% endif %}
+    <h1 class="page-heading">{{ site.config.category_titles[category] }}</h1>
     <div class="column col-{{site.categories.size | minus: 1}}">
       {% include category_list.html category=category.first limit=5 %}
     </div>