docs: fix formattin issue caused by removal of html_style key.

With empty value, it inserts default sphinx css.

Author: rouilj

website/www/conf.py

@@ -128,7 +128,8 @@
 # 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_style = 'default.css'
+html_style = ''
+# 'default.css'
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".