WebHost: delete old docs files (ArchipelagoMW#3503)

Author: Berserker66

WebHost.py

@@ -58,6 +58,7 @@ def create_ordered_tutorials_file() -> typing.List[typing.Dict[str, typing.Any]]
             worlds[game] = world
 
     base_target_path = Utils.local_path("WebHostLib", "static", "generated", "docs")
+    shutil.rmtree(base_target_path, ignore_errors=True)
     for game, world in worlds.items():
         # copy files from world's docs folder to the generated folder
         target_path = os.path.join(base_target_path, game)