support ancient python versions as well

{{cookiecutter.project_slug}}/docs/cleanup.py

@@ -15,8 +15,9 @@ if not os.path.exists(clean_dir):
 
 for file_name in os.listdir(clean_dir):
     file = os.path.join(clean_dir, file_name)
-    match file_name:
-        case "index.rst": continue
-        case _:
+    
+    if file_name == "index.rst":
+        continue
+
     print(f"Removing.. {file}")
     os.remove(file)