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

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

js/node_helper.js

@@ -32,7 +32,6 @@ const NodeHelper = Class.extend({
 
 	/**
 	 * This method is called when a socket notification arrives.
-	 *
 	 * @param {string} notification The identifier of the notification.
 	 * @param {*}  payload The payload of the notification.
 	 */
@@ -42,7 +41,6 @@ const NodeHelper = Class.extend({
 
 	/**
 	 * Set the module name.
-	 *
 	 * @param {string} name Module name.
 	 */
 	setName(name) {
@@ -51,7 +49,6 @@ const NodeHelper = Class.extend({
 
 	/**
 	 * Set the module path.
-	 *
 	 * @param {string} path Module path.
 	 */
 	setPath(path) {
@@ -123,7 +120,6 @@ NodeHelper.checkFetchStatus = function (response) {
 /**
  * Look at the specified error and return an appropriate error type, that
  * can be translated to a detailed error message
- *
  * @param {Error} error the error from fetching something
  * @returns {string} the string of the detailed error message in the translations
  */