Add descriptive text to the infra documentation index page to help
people navigate to the appropriate documentation. This moves the
manual into its own section, system-config and publications into
a section, and leaves the rest of the projects in a section.
Change-Id: I90360ac6822ac93b02fc3bc67b8115dbf750f385
This is a partial cargo-culting of the index job and associated
files from the specs.o.o site, to generate a simple top-level index
page for the http://docs.openstack.org/infra/ tree.
Change-Id: Idb5a8dba58a53c7c8ea1de69e9a4d9b5ef410c78