Use the theme for both local and ReadTheDocs builds

The theme was previously enabled only for local
builds, probably because it was applied by default
by ReadTheDocs before they started shifting
towards requiring explicit configuration in general.

docs/conf.py

@@ -20,6 +20,8 @@
 from django.utils.encoding import force_text
 from django.utils.html import strip_tags
 
+import sphinx_rtd_theme
+
 # If extensions (or modules to document with autodoc) are in another
 # directory, add these directories to sys.path here. If the directory is
 # relative to the documentation root, use os.path.abspath to make it
@@ -164,14 +166,10 @@ def process_docstring(app, what, name, obj, options, lines):
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-html_theme = 'default'
-
-if not False:  # only import and set the theme if we're building docs locally
-    import sphinx_rtd_theme
-
-    html_theme = "sphinx_rtd_theme"
-    html_theme_path = [".", sphinx_rtd_theme.get_html_theme_path()]
+# html_theme = 'default'
 
+html_theme = "sphinx_rtd_theme"
+html_theme_path = [".", sphinx_rtd_theme.get_html_theme_path()]
 
 # Approach 2 for custom stylesheet:
 # adapted from: http://rackerlabs.github.io/docs-rackspace/tools/rtd-tables.html