fix: render call_to_action block so home page exposes 'new thread' button

remarkbox_chaostheory/templates/chaostheory-base.j2

@@ -52,6 +52,11 @@
 
   <div class="clear"></div>
 
+  <div class="call_to_action">
+  {% block call_to_action %}
+  {% endblock %}
+  </div>
+
   <div id="content" class="grid_16">
     {% block content %}
     {% endblock %}