Switch to newer openstackdocstheme and reno versions

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.

Set openstackdocs_pdf_link to link to PDF file. Note that
the link to the published document only works on docs.openstack.org
where the PDF file is placed in the top-level html directory. The
site-preview places the PDF in a pdf directory.

Disable openstackdocs_auto_name to use 'project' variable as name.

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: Ic10edb7103455b477cece3940f150f4345611562

doc/requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-openstackdocstheme>=1.19.0 # Apache-2.0
-reno!=2.3.1,>=1.8.0 # Apache-2.0
-sphinx>=1.8.0,!=2.1.0 # BSD
+openstackdocstheme>=2.2.1 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
+sphinx>=2.0.0,!=2.1.0 # BSD
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD

doc/source/conf.py

@@ -90,10 +90,12 @@ latex_documents = [
 latex_use_xindy = False
 
 # openstackdocstheme options
-repository_name = 'openstack/kayobe'
-use_storyboard = True
+openstackdocs_repo_name = 'openstack/kayobe'
+openstackdocs_pdf_link = True
+openstackdocs_auto_name = False
+openstackdocs_use_storyboard = True
 
-openstack_projects = [
+openstackdocs_projects = [
     'bifrost',
     'diskimage-builder',
     'ironic',

releasenotes/source/conf.py

@@ -133,10 +133,6 @@ html_static_path = ['_static']
 # directly to the root of the documentation.
 # html_extra_path = []
 
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
-
 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
 # html_use_smartypants = True
@@ -253,6 +249,11 @@ texinfo_documents = [
 # -- Options for Internationalization output ------------------------------
 locale_dirs = ['locale/']
 
-openstack_projects = [
+# openstackdocstheme options
+openstackdocs_repo_name = 'openstack/kayobe'
+openstackdocs_use_storyboard = True
+openstackdocs_auto_name = False
+
+openstackdocs_projects = [
     'kayobe',
 ]