update path to docs config file in flake8 exclude list

Author: brainelectronics

.flake8

@@ -33,7 +33,7 @@ exclude =
     # There's no value in checking cache directories
     __pycache__,
     # The conf file is mostly autogenerated, ignore it
-    docs/source/conf.py,
+    docs/conf.py,
     # This contains our built documentation
     build,
     # This contains builds that we don't want to check