Ensure tts CLI tool readme and usage help is in sync

tests/aux_tests/test_readme.py

@@ -0,0 +1,9 @@
+import subprocess
+import sys
+from pathlib import Path
+
+
+def test_readme_up_to_date():
+    root = Path(__file__).parent.parent.parent
+    sync_readme = root / "scripts" / "sync_readme.py"
+    subprocess.check_call([sys.executable, str(sync_readme), "--check"], cwd=root)