Fix deploy-guide publish
Fix deploy-guide publish

We publish deploy-guide to /latest or /branchname - like we do with
normal documents. Fix location for this.

We can use the same logic as for normal repos, keeping in mind that the
docs live under deploy-guide, not doc.

Depends-On: I61cd84be201d14d0a1d5daba3a45c8797496bc7f
Change-Id: Ifff767a95e6283c54033bababd3dae84bb19adb6

openstack-infra/project-config,openstack-infra/project-config