[IMP] *: introduce tables of contents in top-level app pages

Author: fpodoo

content/administration.rst

@@ -1,16 +1,21 @@
 :nosearch:
+:show-content:
+:hide-page-toc:
+:show-toc:
 
-==============
-Administration
-==============
+====================
+Install and Maintain
+====================
+
+These guides provide instructions on how to install, maintain and upgrade Odoo databases.
+
+.. seealso::
+    :doc:`History of Versions <administration/maintain/supported_versions>`
 
 
 .. toctree::
+    :titlesonly:
 
     administration/install
-    administration/deployment
-    administration/update
-    administration/db_upgrade
+    administration/maintain
     administration/odoo_sh
-    administration/db_management
-    administration/enterprise