code: def resolve_file(mgr, filename):
  	
  	path = importlib_resources.path('pmxbot.web.templates', filename)
  	return str(mgr.enter_context(path))
docs: Given a file manager (ExitStack), load the filename
  	and set the exit stack to clean up. See
  	https://importlib-resources.readthedocs.io/en/latest/migration.html#pkg-resources-resource-filename
  	for more details.