Andreas Jaeger 9cc3f52ac3 Switch to newer openstackdocstheme and reno versions
Switch to openstackdocstheme 2.2.0 and reno 3.1.0 versions. Using
these versions will allow especially:
* Linking from HTML to PDF document
* Allow parallel building of documents
* Fix some rendering

Update Sphinx version as well.

Remove docs requirements from lower-constraints, they are not needed
during install or test but only for docs building.

openstackdocstheme renames some variables, so follow the renames
before the next release removes them. A couple of variables are also
not needed anymore, remove them.

Depends-On: https://review.opendev.org/728938
Change-Id: I70c7edf8b95cde890e6263195be1de6bb826e700
2020-05-18 20:55:51 +02:00
..