Add pre-commit hook and use in CI.

setup.cfg

@@ -1,9 +1,3 @@
-[flake8]
-max-line-length = 88
-
-[ruff]
-line-length = 88
-
 [isort]
 multi_line_output = 3
 include_trailing_comma = True
@@ -13,6 +7,3 @@ ensure_newline_before_comments = True
 line_length = 88
 add_imports =
     from __future__ import annotations
-
-[mypy]
-ignore_missing_imports = True