update conf.py for the sphinx python version upgrade

Author: mollyheamazon

doc/conf.py

@@ -83,16 +83,11 @@
 
 html_css_files = [
     "https://cdn.datatables.net/1.10.23/css/jquery.dataTables.min.css",
+    "theme_overrides.css",
+    "pagination.css",
+    "search_accessories.css",
 ]
 
-html_context = {
-    "css_files": [
-        "_static/theme_overrides.css",
-        "_static/pagination.css",
-        "_static/search_accessories.css",
-    ]
-}
-
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {"python": ("http://docs.python.org/", None)}