Replace the devstack.org with devstack docs url

Change-Id: I870300b90e1e5f4f382238c209fc5416914d49f0
diff --git a/setup.cfg b/setup.cfg
index 5887134..e4b2888 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -5,7 +5,7 @@
     README.md
 author = OpenStack
 author-email = openstack-dev@lists.openstack.org
-home-page = http://devstack.org
+home-page = http://docs.openstack.org/developer/devstack
 classifier =
     Intended Audience :: Developers
     License :: OSI Approved :: Apache Software License