rm dead docs file

docs/_templates/layout.html

@@ -1,20 +0,0 @@
-{% extends "!layout.html" %}
-
-{% set css_files = css_files + ["_static/custom_collapsible_code.css"] %}
-
-# sadly, I didn't find a css style way to add custom JS to a list that is automagically added to head like CSS (above) #}
-{% block extrahead %}
-<script type="text/javascript" src="_static/custom_collapsible_code.js"></script>
-{% endblock %}
-
-{% block footer %}
-<script type="text/javascript">
-    $(document).ready(function() {
-        // using this approach as we don't have access to the jQuery selectors
-        // when executing the function on load in HEAD
-        makeCodeBlocksCollapsible();
-    });
-</script>
-{% endblock %}
-
-