feat(main): Add base theme: This is the falcon theme out of the box.

This is falcon v3.1.2

_dev/js/theme/components/TopMenu.js

@@ -0,0 +1,30 @@
+import $ from 'jquery';
+
+export default class TopMenu {
+  constructor(el) {
+    this.$el = $(el);
+  }
+
+  init() {
+    const self = this;
+    self.$el.hoverIntent({
+      over: self.toggleClassSubMenu,
+      out: self.toggleClassSubMenu,
+      selector: ' > li',
+      timeout: 300,
+    });
+  }
+
+  toggleClassSubMenu() {
+    const $item = $(this);
+    let expanded = $item.attr('aria-expanded');
+
+    if (typeof expanded !== 'undefined') {
+      expanded = expanded.toLowerCase() === 'true';
+      $item.toggleClass('main-menu__item--active').attr('aria-expanded', !expanded);
+      $('.main-menu__sub', $item)
+        .attr('aria-expanded', !expanded)
+        .attr('aria-hidden', expanded);
+    }
+  }
+}