code: func Render404(w http.ResponseWriter, tpl *template.Template) {
  	Render(w, ErrorData{
  		http.StatusNotFound,
  		"Sorry, the URL you requested was not found on this server... Or you're lost :-/",
  	},
  		http.StatusNotFound,
  		tpl,
  	)
  }
docs: // Render404 - used to render a 404 page