Add title to theme explorer

Author: tcbegley

docs/templates/theme-explorer.html

@@ -1,5 +1,6 @@
 {% from "macros/theme-explorer-navbar.html" import theme_explorer_navbar %}
 {% extends "base.html" %}
+{% block title %}<title>Theme explorer - dbc docs</title>{% endblock %}
 {% block header %}
 {{ theme_explorer_navbar() }}
 {% endblock %}