Switch to openstackdocstheme 2.2.1 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 problems
Update Sphinx version as well.
Change pygments_style to 'native' since old theme version always used
'native' and the theme now respects the setting and using 'sphinx' can
lead to some strange rendering.
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.
See also
http://lists.openstack.org/pipermail/openstack-discuss/2020-May/014971.html
Change-Id: I4ae8e3811b184219c1715af0629f668b393ad3c2
Also:
- add license headers
- set up tox for flake8 checks and venv
- remove run_tests.sh, tools/ and other stuff we don't need at the moment
- add basic sphinx setup for later use
Change-Id: I0d34fb9fd0bfd351d20474da88715b30ff3c3d61
jiaqi07