Simplify clean

Makefile

@@ -16,10 +16,7 @@ clean:
 	rm -rf build/
 	rm -rf dist/
 	rm -rf src/kumacli.egg-info/
-	rm -rf src/kumacli/__pycache__/
-	rm -rf src/kumacli/cmd/__pycache__/
-	find . -name "*.pyc" -delete
-	find . -name "*.pyo" -delete
+	find . -name "*.pyc" -o -name "*.pyo" -delete
 	find . -name "__pycache__" -type d -exec rm -rf {} + 2>/dev/null || true
 	@echo "Clean complete."