Add hacking to indices and redirects

Currently http://docs.openstack.org/developer/hacking/ does not reqirect
to /hacking/latest - fix with adding hacking to our project data.

This also adds it to our index.

Change-Id: Ifa9cd023fdd50062ecf0502d203f5de27990c36f

www/project-data/latest.yaml

@@ -733,6 +733,10 @@
   service: Test harness to exercise the upgrade process between releases.
   type: tool
 
+- name: hacking
+  service: Hacking guideline enforcement
+  type: tool
+
 - name: refstack
   service: Toolset for testing interoperability between OpenStack clouds.
   type: tool