update examples

.env.example

@@ -4,15 +4,8 @@ BACKEND=bancho.py
 
 # :: bancho.py
 # :: [email protected]
-BANCHO_PY_AVATAR_LOCATION=/path/to/avatars/folder # should be a resolved path otherwise will be relative from project root.
-BANCHO_PY_API_V1_ENDPOINT=http://api.dev.ppy.sb/v1
-AVATAR_DOMAIN=//a.ppy.sb
 DB_DSN=mysql://username:password@localhost:3306/database
-REDIS_URL=redis://localhost # required if either LEADERBOARD_SOURCE or SESSION_STORE is set to 'redis'
-
-AVATAR_VERSIONING=header # : api   | header
-LEADERBOARD_SOURCE=redis # : redis | database
-SESSION_STORE=redis      # : redis | memory
+REDIS_URL=redis://localhost # required if you are using redis session store.
 # :: end of bancho.py
 # :: end of [email protected]