add .gitattributes and fix prettier/js warnings (#3094)

see title, as discussed in
https://github.com/MichMich/MagicMirror/pull/3093

modules/default/weather/providers/ukmetoffice.js

@@ -189,7 +189,6 @@ WeatherProvider.register("ukmetoffice", {
 
 	/**
 	 * Generates an url with api parameters based on the config.
-	 *
 	 * @param {string} forecastType daily or 3hourly forecast
 	 * @returns {string} url
 	 */