Start README.rst with a better title

Now that we are using gitea the contents of our README.rst are
more prominently displayed. Starting it with a "Team and repository
tags" title is a bit confusing. This change makes it start with the
name of the project instead.

Change-Id: I538c8db4b45eb3f65dfe48f0c3ce006a8dfee4df

README.rst

@@ -1,6 +1,6 @@
-========================
-Team and repository tags
-========================
+================
+OpenStack Glance
+================
 
 .. image:: https://governance.openstack.org/tc/badges/glance.svg
     :target: https://governance.openstack.org/tc/reference/tags/index.html
@@ -19,11 +19,7 @@ Team and repository tags
 
 .. Change things from this point on
 
-======
-Glance
-======
-
-Glance is a project that provides services and associated libraries
+Glance is an OpenStack project that provides services and associated libraries
 to store, browse, share, distribute and manage bootable disk images,
 other data closely associated with initializing compute resources,
 and metadata definitions.
@@ -66,7 +62,7 @@ reported to the appropriate bug tracker. You can raise bugs here:
 * `Bug Tracker <https://bugs.launchpad.net/glance/>`_
 
 Release notes
------------------
+-------------
 
 To learn more about Glance's new features, optimizations, and changes
 between versions, consult the release notes online at: