moving to the default read the docs sphinx theme

documentation/source/conf.py

@@ -94,7 +94,7 @@
 # The style sheet to use for HTML and HTML Help pages. A file of that name
 # must exist either in Sphinx' static/ path, or in one of the custom paths
 # given in html_static_path.
-html_theme = 'default.css'
+html_style = 'default.css'
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".