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.

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: If5b3ea5c50a91f623b0dd4d1dd347ee8a6b90290

doc/requirements.txt

@@ -1,4 +1,4 @@
-sphinx>=1.8.0,!=2.1.0  # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
 sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD
-reno>=2.5.0 # Apache-2.0
-openstackdocstheme>=1.18.1 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
+openstackdocstheme>=2.2.1 # Apache-2.0

doc/source/conf.py

@@ -48,7 +48,7 @@ add_function_parentheses = True
 add_module_names = True
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # -- Options for HTML output --------------------------------------------------
 
@@ -60,11 +60,6 @@ html_theme = 'openstackdocs'
 # Output file base name for HTML help builder.
 htmlhelp_basename = '%sdoc' % project
 
-# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
-# using the given strftime format.
-# html_last_updated_fmt = '%b %d, %Y'
-html_last_updated_fmt = '%Y-%m-%d %H:%M'
-
 # Add any paths that contain "extra" files, such as .htaccess or
 # robots.txt.
 html_extra_path = ['_extra']
@@ -90,6 +85,8 @@ latex_use_xindy = False
 #intersphinx_mapping = {'https://docs.python.org/3/': None}
 
 # -- Options for openstackdocstheme -------------------------------------------
-repository_name = 'openstack/castellan'
-bug_project = 'castellan'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/castellan'
+openstackdocs_pdf_link = True
+openstackdocs_auto_name = False
+openstackdocs_bug_project = 'castellan'
+openstackdocs_bug_tag = ''

releasenotes/source/conf.py

@@ -52,9 +52,10 @@ source_suffix = '.rst'
 master_doc = 'index'
 
 # General information about the project.
-repository_name = 'openstack/castellan'
-bug_project = 'castellan'
-bug_tag = 'doc'
+openstackdocs_repo_name = 'openstack/castellan'
+openstackdocs_auto_name = False
+openstackdocs_bug_project = 'castellan'
+openstackdocs_bug_tag = 'doc'
 project = u'Castellan Release Notes'
 copyright = u'2017, Castellan Developers'
 
@@ -95,7 +96,7 @@ exclude_patterns = []
 # show_authors = False
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+pygments_style = 'native'
 
 # A list of ignored prefixes for module index sorting.
 # modindex_common_prefix = []
@@ -144,10 +145,6 @@ 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