Make the versions_menu a theme setting

Added a theme setting to add/remove the versions menu shown a the
bottom left side of the screen.

By default is `True` to keep backward compatibility.

Author: humitos

docs/configuring.rst

@@ -25,6 +25,7 @@ file of this repository, and can be defined in your project's ``conf.py`` via
         'prev_next_buttons_location': 'bottom',
         'style_external_links': False,
         'vcs_pageview_mode': '',
+        'versions_menu': True,
         # Toc options
         'collapse_navigation': False,
         'sticky_navigation': True,
@@ -49,6 +50,7 @@ Base options
 * ``vcs_pageview_mode`` String. Changes how to view files when using `display_github`, `display_gitlab`, etc.
   When using Github or Gitlab this can be: `blob` (default), `edit`, or `raw`,
   on Bitbucket, this can be either: `view` (default) or `edit`.
+* ``versions_menu`` Bool. Whether or not shows the bottom left menu listing the versions and links to VCS repository.
 
 TOC Options
 ~~~~~~~~~~~

sphinx_rtd_theme/theme.conf

@@ -16,3 +16,4 @@ display_version = True
 prev_next_buttons_location = bottom
 style_external_links = False
 vcs_pageview_mode =
+versions_menu = True

sphinx_rtd_theme/versions.html

@@ -7,7 +7,7 @@
       <span class="fa fa-caret-down"></span>
     </span>
     <div class="rst-other-versions">
-      {% if versions_menu %}
+      {% if theme_versions_menu %}
       <dl>
         <dt>{{ _('Versions') }}</dt>
         {% for slug, url in versions %}