Restructured global TOC

* Changed "Table Of Contents" link to a plain heading.
* Removed Customize, API Reference, 3rd party plugins links altogether.
* Added an "About the project" heading

Author: evildmp

doc/en/_templates/globaltoc.html

@@ -1,4 +1,4 @@
-<h3><a href="{{ pathto(master_doc) }}">{{ _('Table Of Contents') }}</a></h3>
+<h3>Contents</h3>
 
 <ul>
   <li><a href="{{ pathto('index') }}">Home</a></li>
@@ -7,15 +7,13 @@ <h3><a href="{{ pathto(master_doc) }}">{{ _('Table Of Contents') }}</a></h3>
   <li><a href="{{ pathto('how-to/index') }}">How-to guides</a></li>
   <li><a href="{{ pathto('reference/index') }}">Reference guides</a></li>
   <li><a href="{{ pathto('explanation/index') }}">Explanation</a></li>
-
-  <li><a href="{{ pathto('example/index') }}">Examples</a></li>
-
-  <li><a href="{{ pathto('reference/customize') }}">Customize</a></li>
-  <li><a href="{{ pathto('reference/reference') }}">API Reference</a></li>
-  <li><a href="{{ pathto('reference/plugin_list') }}">3rd party plugins</a></li>
-
   <li><a href="{{ pathto('contents') }}">Complete table of contents</a></li>
+  <li><a href="{{ pathto('example/index') }}">Library of examples</a></li>
+</ul>
+
+<h3>About the project</h3>
 
+<ul>
   <li><a href="{{ pathto('changelog') }}">Changelog</a></li>
   <li><a href="{{ pathto('contributing') }}">Contributing</a></li>
   <li><a href="{{ pathto('backwards-compatibility') }}">Backwards Compatibility</a></li>