Remove jQuery from docs/repo.

Some of the snippets need to be updated later.

site/docs/4.3/assets/js/src/application.js

@@ -67,11 +67,10 @@
     var exampleModal = document.getElementById('exampleModal')
     if (exampleModal) {
       exampleModal.addEventListener('show.bs.modal', function (event) {
-        var button = event.relatedTarget                     // Button that triggered the modal
+        var button = event.relatedTarget // Button that triggered the modal
         var recipient = button.getAttribute('data-whatever') // Extract info from data-* attributes
 
-        // If necessary, you could initiate an AJAX request here (and then do the updating in a callback).
-        // Update the modal's content. We'll use jQuery here, but you could use a data binding library or other methods instead.
+        // Update the modal's content.
         var modalTitle = exampleModal.querySelector('.modal-title')
         var modalBodyInput = exampleModal.querySelector('.modal-body input')