fix RTD

Author: bmuller

docs/conf.py

@@ -105,12 +105,11 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-# on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
-# if on_rtd:
-#    html_theme = "default"
-# else:
-#    html_theme_path = ["_themes"]
-html_theme = "sphinx_rtd_theme"
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+if on_rtd:
+    html_theme = "default"
+else:
+    html_theme = "sphinx_rtd_theme"
 
 html_theme_options = {}