Switch to newer openstackdocstheme version

Switch to openstackdocstheme 2.2.1 version. Using
this version 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: I9843c6b66d4411857cb19c5d176d39b200423257

doc/source/conf.py

@@ -29,14 +29,11 @@ extensions = [
     'sphinxcontrib.seqdiag',
     'sphinxcontrib.nwdiag',
     'openstackdocstheme',
-    # TODO(tbarron): re-enable yasfb after
-    # https://github.com/sphinxcontrib/yasfb/commit/62d18c66835320af4a71fb088cb502041478fb16
-    # is released; it currently breaks with python 3.5
-    # 'yasfb',
+    'yasfb',
 ]
 
 # Feed configuration for yasfb
-feed_base_url = 'http://specs.openstack.org/openstack/manila-specs'
+feed_base_url = 'https://specs.openstack.org/openstack/manila-specs'
 feed_author = 'OpenStack Manila Team'
 
 exclude_patterns = [
@@ -65,7 +62,7 @@ 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 --------------------------------------------------
 
@@ -78,10 +75,6 @@ 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 = '%Y-%m-%d %H:%M'
-
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass
 # [howto/manual]).
@@ -95,6 +88,6 @@ latex_documents = [
 # Example configuration for intersphinx: refer to the Python standard library.
 # intersphinx_mapping = {'http://docs.python.org/': None}
 
-repository_name = 'openstack/manila-specs'
-bug_project = 'manila'
-bug_tag = ''
+openstackdocs_repo_name = 'openstack/manila-specs'
+openstackdocs_bug_project = 'manila'
+openstackdocs_bug_tag = ''

requirements.txt

@@ -3,9 +3,9 @@ pbr>=2.0.0
 actdiag
 blockdiag
 nwdiag
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=2.2.1 # Apache-2.0
 seqdiag
-sphinx>=1.5.1,!=1.6.1  # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
 sphinxcontrib-actdiag
 sphinxcontrib-blockdiag # BSD
 sphinxcontrib-nwdiag