add 'false' option to effect type

index.html

@@ -193,6 +193,7 @@
                         <a class="dropdown-item" data-settings='{"effect": "pan"}' href="#">Pan</a>
                         <a class="dropdown-item" data-settings='{"effect": "parallax"}' href="#">Parallax</a>
                         <a class="dropdown-item" data-settings='{"effect": "zoom"}' href="#">Zoom</a>
+                        <a class="dropdown-item" data-settings='{"effect": false}' href="#">None</a>
                     </div>
                 </div>
                 <div class="btn-group col-md-auto">