Remove unused expand functionality

Author: jseldess

_includes/expand.html

@@ -24,10 +24,6 @@ <h1 class="post-title-main">{% if page.homepage == true %} {{site.homepage_title
       <div id="toc"></div>
    {% endif %}
 
-   {% if page.expand == true %}
-      {% include expand.html %}
-   {% endif %}
-
    {{content}}
 
    {% if page.feedback != false %}