Try to prevent light-mode flashing when changing pages

Author: lukelbd

docs/_templates/layout.html

@@ -18,7 +18,7 @@
   <link rel="stylesheet" href="{{ pathto("_static/custom.css", True) }}" type="text/css">
   {{ super() }}
 {% endblock %}
-{% block footer %}
+{% block document %}
   <script type="text/javascript" src={{ pathto("_static/custom.js", True) }}></script>
   {{ super() }}
 {% endblock %}