[www] Enable content for heat in www/project-data/pike.yaml
[www] Enable content for heat in www/project-data/pike.yaml

This uncomments heat related content.

Change-Id: I0aa2732bf767dd68721ca2704bba1a7f587ad713
Closes-Bug: #1713503

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals