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. 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. 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. See also http://lists.openstack.org/pipermail/openstack-discuss/2020-May/014971.html Change-Id: I3b5249bee4f8452cc3a717dc93d2eca70002ce59
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