core: deprecate my.cfg, instead my.config can (and should be) used directly

my/cfg.py

@@ -1,19 +1,8 @@
-"""
-A helper to allow configuring the modules dynamically.
-
-Usage:
-
-  from my.cfg import config
-
-After that, you can set config attributes:
-
-  class user_config:
-      export_path = '/path/to/twitter/exports'
-  config.twitter = user_config
-"""
-# TODO do I really need it?
-
-# todo why do we bring this into scope? don't remember..
 import my.config as config
 
 from .core import __NOT_HPI_MODULE__
+
+from .core import warnings as W
+
+# still used in Promnesia, maybe in dashboard?
+W.high("DEPRECATED! Please import my.config directly instead.")