new frontend added

templates/index.html

@@ -3041,7 +3041,7 @@
     </div>
 
     <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
-    <script src="./app.js"></script>
+    <script src="{{ url_for('static', filename='app.js') }}"></script>
     <script>
       $("#drop").on("change", function () {
         var value = $(this).val();