chore: clean up templates for TACC/Core-CMS#710 (#189)

* chore: move `page_attribute "page_title"` to base

Requires: TACC/Core-CMS#710

* chore: remove superfluous code

This code says "Render the assets_font block exactly as it would be rendered had I not said anything". So.... just don't say anything.

Author: wesleyboar

_3dem_cms/templates/fullwidth.html

@@ -1,10 +1,6 @@
 {% extends "base.html" %}
 {% load cms_tags static %}
 
-{% block assets_font %}
-  {{ block.super }}
-{% endblock assets_font %}
-
 {# To remove container and breadcrumbs #}
 {% block content %}
   {% block cms_content %}