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.

Set openstackdocs_auto_name to use 'project' 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.

Remove docs requirements from lower-constraints, they are not needed
during install or test but only for docs building.

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: I88d35727272813aa5371969e3ea3e763e1a12700

doc/requirements.txt

@@ -8,7 +8,7 @@
 #
 # Requirements for docs
 mock>=2.0.0 # BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
+openstackdocstheme>=2.2.1 # Apache-2.0
-reno>=2.5.0 # Apache-2.0
+reno>=3.1.0 # Apache-2.0
-sphinx>=1.8.0,!=2.1.0 # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
 sphinxcontrib-apidoc>=0.2.0  # BSD

doc/source/conf.py

@@ -22,15 +22,11 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.
 
-from __future__ import print_function
-
 import os
 import sys
 
 import django
 
-from zun_ui import version as zunui_ver
-
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 ROOT = os.path.abspath(os.path.join(BASE_DIR, "..", ".."))
 
@@ -80,14 +76,6 @@ master_doc = 'index'
 project = u'Zun UI'
 copyright = u'2016, OpenStack Foundation'
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-# The short X.Y version.
-version = zunui_ver.version_info.version_string()
-# The full version, including alpha/beta/rc tags.
-release = zunui_ver.version_info.release_string()
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
@@ -119,7 +107,7 @@ 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 = []
@@ -134,9 +122,11 @@ nitpicky = False
 html_theme = 'openstackdocs'
 
 # openstackdocstheme options
-repository_name = 'openstack/zun-ui'
+openstackdocs_repo_name = 'openstack/zun-ui'
-bug_project = 'zun-ui'
+openstackdocs_pdf_link = True
-bug_tag = ''
+openstackdocs_bug_project = 'zun-ui'
+openstackdocs_bug_tag = ''
+openstackdocs_auto_name = False
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -167,9 +157,6 @@ bug_tag = ''
 # so a file named "default.css" will overwrite the builtin "default.css".
 # html_static_path = ['']
 
-# Must set this variable to include year, month, day, hours, and minutes.
-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

lower-constraints.txt

@@ -45,7 +45,6 @@ msgpack==0.5.6
 munch==2.2.0
 netaddr==0.7.19
 netifaces==0.10.6
-openstackdocstheme==1.18.1
 openstacksdk==0.12.0
 os-client-config==1.29.0
 os-service-types==1.2.0
@@ -80,7 +79,6 @@ python-zunclient==3.5.0
 pytz==2018.3
 PyYAML==3.12
 rcssmin==1.0.6
-reno==2.5.0
 requests==2.18.4
 requestsexceptions==1.4.0
 rfc3986==1.1.0
@@ -89,9 +87,6 @@ semantic-version==2.6.0
 simplejson==3.13.2
 six==1.11.0
 snowballstemmer==1.2.1
-Sphinx==1.8.0
-sphinxcontrib-apidoc===0.2.0
-sphinxcontrib-websupport==1.0.1
 stevedore==1.28.0
 testtools==2.3.0
 traceback2==1.4.0

releasenotes/source/conf.py

@@ -91,7 +91,7 @@ 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 = []
@@ -107,9 +107,10 @@ pygments_style = 'sphinx'
 html_theme = 'openstackdocs'
 
 # openstackdocstheme options
-repository_name = 'openstack/zun-ui'
+openstackdocs_repo_name = 'openstack/zun-ui'
-bug_project = 'zun-ui'
+openstackdocs_bug_project = 'zun-ui'
-bug_tag = ''
+openstackdocs_bug_tag = ''
+openstackdocs_auto_name = False
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -145,9 +146,6 @@ bug_tag = ''
 # directly to the root of the documentation.
 # html_extra_path = []
 
-# Must set this variable to include year, month, day, hours, and minutes.
-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