refactor: replace the deprecated js api

_javascript/commons/mode-toggle.js

@@ -2,12 +2,12 @@
  * Listener for theme mode toggle
  */
 $(function () {
-    $(".mode-toggle").click((e) => {
+    $(".mode-toggle").on('click',(e) => {
         const $target = $(e.target);
         let $btn = ($target.prop("tagName") === "button".toUpperCase() ?
             $target : $target.parent());
 
-        $btn.blur(); // remove the clicking outline
+        $btn.trigger('blur'); // remove the clicking outline
         flipMode();
     });
 });