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: Iaf6c162b26a32d16a083aa721aa084807af8cd60

README.rst

@@ -1,18 +1,15 @@
-========================
-Team and repository tags
-========================
+===============
+OpenStack Swift
+===============
 
 .. image:: https://governance.openstack.org/tc/badges/swift.svg
     :target: https://governance.openstack.org/tc/reference/tags/index.html
 
 .. Change things from this point on
 
-Swift
-=====
-
-A distributed object storage system designed to scale from a single
-machine to thousands of servers. Swift is optimized for multi-tenancy
-and high concurrency. Swift is ideal for backups, web and mobile
+OpenStack Swift is a distributed object storage system designed to scale
+from a single machine to thousands of servers. Swift is optimized for
+multi-tenancy and high concurrency. Swift is ideal for backups, web and mobile
 content, and any other unstructured data that can grow without bound.
 
 Swift provides a simple, REST-based API fully documented at