hide sidebar in xs

src/server/views/layout/layout.html

@@ -134,7 +134,7 @@
 
   <div class="d-flex">
     {# Sidebar #}
-    <nav>
+    <nav class="d-none d-sm-block">
       <div id="grw-sidebar" class="grw-sidebar"></div>
     </nav>
     <div id="page-wrapper" class="flex-grow-1">