Added header and licensing to app.js.
+/**
+ * ______ ___
+ * / ____/___ / | _____________ __________
+ * / / __/ __ \/ /| |/ ___/ ___/ _ \/ ___/ ___/
+ * / /_/ / /_/ / ___ / /__/ /__/ __(__ |__ )
+ * \____/\____/_/ |_\___/\___/\___/____/____/
+ *
+ * The MIT License (MIT)
+ * Copyright (c) 2009-2022 Gerardo Orellana <hello @ goaccess.io>
+*/
+
/*jshint sub:true*/
(function () {
'use strict';
