Remove old HTML headers

Change-Id: I39107df88aeb89d3364ad479d8c313b7a79b9440
diff --git a/doc/source/overview.rst b/doc/source/overview.rst
index cedf941..e3cf75d 100644
--- a/doc/source/overview.rst
+++ b/doc/source/overview.rst
@@ -1,13 +1,6 @@
-`DevStack </>`__
-
--  `Overview <overview.html>`__
--  `Changes <changes.html>`__
--  `FAQ <faq.html>`__
--  `git.openstack.org <https://git.openstack.org/cgit/openstack-dev/devstack>`__
--  `Gerrit <https://review.openstack.org/#/q/status:open+project:openstack-dev/devstack,n,z>`__
-
-Overview DevStack from a cloud-height view
-------------------------------------------
+========
+Overview
+========
 
 DevStack has evolved to support a large number of configuration options
 and alternative platforms and support services. That evolution has grown