Add swagger-ui docs and clean up swagger-ui options (#1739)

Contributes to #1531

tests/test_cli.py

@@ -1,7 +1,6 @@
 import logging
 from unittest.mock import MagicMock
 
-import importlib_metadata
 import pytest
 from click.testing import CliRunner
 from connexion.cli import main
@@ -9,6 +8,11 @@ from connexion.exceptions import ResolverError
 
 from conftest import FIXTURES_FOLDER
 
+try:
+    import importlib_metadata
+except ImportError:
+    import importlib.metadata as importlib_metadata
+
 
 @pytest.fixture(scope="function")
 def mock_app_run(app_class, monkeypatch):