Update home page link in cfg file

Following kuryr convention in kuryr-libnetwork

Change-Id: I7750d8a930722ea14147ccf9691207c935e92c58

setup.cfg

@@ -5,7 +5,7 @@ description-file =
     README.rst
 author = OpenStack
 author-email = openstack-dev@lists.openstack.org
-home-page = http://www.openstack.org/
+home-page = http://docs.openstack.org/developer/kuryr-libnetwork
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology