Docs: show other versions

Change-Id: I6e791016ffa8ab9f2cebccb57f9a5cb5d3b41456

doc/source/conf.py

@@ -69,6 +69,10 @@ pygments_style = 'sphinx'
 html_theme = 'openstackdocs'
 # html_static_path = ['static']
 
+html_theme_options = {
+    "show_other_versions": True,
+}
+
 # Output file base name for HTML help builder.
 htmlhelp_basename = '%sdoc' % project
 

doc/source/index.rst

@@ -38,9 +38,8 @@ Site Notes
 
 This documentation is continually updated and may not represent the state of
 the project at any specific prior release. To access documentation for a
-previous release of kolla, append the OpenStack release name to the URL. For
-example, to access Kolla documentation for the Stein release:
-https://docs.openstack.org/kolla/stein
+previous release of kolla, choose one of the OpenStack release names on
+the right of the title.
 
 Administrator Guide
 ===================