Fixed missing styling of forum/discord logos on homepage

The logos were added in 2b9b50a
but a class was missing on the main container.

Author: bmispelon

djangoproject/templates/homepage.html

@@ -3,7 +3,7 @@
 
 {% block sectionid %}homepage{% endblock %}
 {% block body_class %}homepage{% endblock %}
-{% block layout_class %}sidebar-right{% endblock %}
+{% block layout_class %}column-container sidebar-right{% endblock %}
 
 {% block header %}
   <h1 class="visuallyhidden">Django</h1>