For using opendev-tox-docs, jobs need to publish to a "html"
subdirectory, update the docs-site and specs jobs.
Update .gitignore for this.
Update python files to use yaml.safe_load to avoid a warning.
Remove unused docs environment from tox.ini.
Depends-On: https://review.opendev.org/682213
Change-Id: I8d7032a6e836ec26f347d16abd600514089a677b
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