Resolve #3469297 "Add a hotkey"

Closes #3469297

js/tour.js

@@ -50,6 +50,14 @@
           model.set('isActive', true);
         }
 
+        document.addEventListener('keydown', function (event) {
+          if (event.altKey && event.code === 'KeyT') {
+            model.set('isActive', true);
+            event.preventDefault();
+            event.stopPropagation();
+          }
+        });
+
         // Provide an API.
         Drupal.tour.setActive = function (active = true) {
           model.set('isActive', active);