code: func registerStatic(root string) {
  	// Keep these static file handlers in sync with app.yaml.
  	http.Handle("/favicon.ico", http.FileServer(http.Dir(filepath.Join(root, "static", "img"))))
  	static := http.FileServer(http.Dir(root))
  	http.Handle("/content/img/", static)
  	http.Handle("/static/", static)
  }
docs: // registerStatic registers handlers to serve static content
  // from the directory root.