Bump the openstackdocstheme extension to 1.20

Some options are now automatically configured by the version 1.20[1]:
- project
- html_last_updated_fmt
- latex_engine
- latex_elements

[1]https://docs.openstack.org/openstackdocstheme/latest/#using-the-theme

Change-Id: Idf0df3c94d5b06842578d225e7476808bbb786f7

doc/requirements.txt

@@ -1,4 +1,4 @@
 sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
 sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2;python_version>='3.4' # BSD
-openstackdocstheme>=1.11.0 # Apache-2.0
+openstackdocstheme>=1.20.0 # Apache-2.0
 pbr>=1.6 # Apache-2.0

doc/source/conf.py

@@ -47,7 +47,6 @@ source_suffix = '.rst'
 master_doc = 'index'
 
 # General information about the project.
-project = u'Puppet OpenStack Guide'
 copyright = Markup(u'%s, OpenStack Contributors '
                    u'- use the <a href="https://opendev.org/'
                    u'openstack/puppet-openstack-guide">puppet-openstack-guide git repo</a> '
@@ -122,7 +121,6 @@ html_theme = 'openstackdocs'
 
 # 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.
@@ -167,17 +165,6 @@ htmlhelp_basename = 'Puppet-OpenStack-Guidedoc'
 
 # -- Options for LaTeX output --------------------------------------------------
 
-latex_elements = {
-# The paper size ('letterpaper' or 'a4paper').
-#'papersize': 'letterpaper',
-
-# The font size ('10pt', '11pt' or '12pt').
-#'pointsize': '10pt',
-
-# Additional stuff for the LaTeX preamble.
-#'preamble': '',
-}
-
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [