Remove unused isort config

Author: pjonsson

setup.cfg

@@ -47,17 +47,3 @@ exclude =
     build,
     dist,
     cubedash/_version.py,
-
-[isort]
-line_length=88
-multi_line_output=3
-include_trailing_comma=True
-force_grid_wrap=0
-
-# isort groups imports in three groups, but sometimes guesses wrong.
-# Adding more packages here is better than commiting an unnecessary reorder.
-known_standard_library=dataclasses
-known_third_party=rapidjson,flask_themes,dateutil
-# datacube technically isn't first party, but isort guessed wrong initially and
-# we'd prefer consistency.
-known_first_party=cubedash,datacube