code: func (a *API) robeaux(res http.ResponseWriter, req *http.Request) {
  	path := req.URL.Path
  	buf, err := robeaux.Asset(path[1:])
  	if err != nil {
  		http.Error(res, err.Error(), http.StatusNotFound)
  		return
  	}
  	t := strings.Split(path, ".")
  	if t[len(t)-1] == "js" {
  		res.Header().Set("Content-Type", "text/javascript; charset=utf-8")
  	} else if t[len(t)-1] == "css" {
  		res.Header().Set("Content-Type", "text/css; charset=utf-8")
  	} else if t[len(t)-1] == "html" {
  		res.Header().Set("Content-Type", "text/html; charset=utf-8")
  	}
  	res.Write(buf)
  }
docs: // robeaux returns handler for robeaux routes.
  // Writes asset in response and sets correct header