添加Metronic（作为LFS）

frontend/static/assets/admin/pages/scripts/portlet-draggable.js

@@ -0,0 +1,27 @@
+var PortletDraggable = function () {
+
+    return {
+        //main function to initiate the module
+        init: function () {
+
+            if (!jQuery().sortable) {
+                return;
+            }
+
+            $("#sortable_portlets").sortable({
+                connectWith: ".portlet",
+                items: ".portlet",
+                opacity: 0.8,
+                coneHelperSize: true,
+                placeholder: 'sortable-box-placeholder round-all',
+                forcePlaceholderSize: true,
+                tolerance: "pointer"
+            });
+
+            $(".column").disableSelection();
+
+        }
+
+    };
+
+}();