move jquery library to head in layout

backstage/templates/layout.html

@@ -17,6 +17,7 @@
   
   <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js"></script>
   <script src="https://unpkg.com/axios/dist/axios.min.js"></script> 
+  <script src='https://code.jquery.com/jquery-3.2.1.slim.min.js'></script>
 
   <style>
     .outerDiv {
@@ -123,7 +124,6 @@
   </div><!-- container -->
   </div>
   <!-- partial -->
-  <script src='https://code.jquery.com/jquery-3.2.1.slim.min.js'></script>
   <script src='https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js'></script>
   <script src='https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js'></script>
   <script type="text/javascript" src="{{url_for('static', filename='js/sidebar.js')}}"></script>