only show first heading from the glossary on home page
only show first heading from the glossary on home page

Change-Id: I81fea1c2e4d51994367c42d8f973a9503c366a09
Signed-off-by: Doug Hellmann <0798ebecfb7bc4dfb9d0445c2fa030eb64e1fa1c@doughellmann.com>

openstack/glance,openstack/glance,openstack/glance