added custom theme

Author: dangunter

Diff for: gmlc_theme/main.html

@@ -0,0 +1,5 @@
+{% extends "base.html" %}
+
+{%- block site_name %}
+<a class="navbar-brand" href="{{ nav.homepage.url|url }}"><img  src="{{ config.site_logo|url }}"></img></a>
+{%- endblock %}