improve sidebar in mobile view

src/core/Resources/assets/css/admin.scss

@@ -169,6 +169,16 @@ tr.table-primary-light {
     width: 260px;
     display: inline-block;
 
+    .sidebar-toggler {
+        display: none;
+        text-align: right;
+        padding-right: 5px;
+
+        .fa {
+            color: #fff;
+        }
+    }
+
     .nav-link {
         font-weight: 500;
         color: #333;
@@ -257,15 +267,21 @@ tr.table-primary-light {
         width: calc(100vw - 50px);
     }
 
-    .sidebar-sticky {
-        width: 50px;
-        max-width: 100% !important;
+    .sidebar {
+        .sidebar-toggler {
+            display: block;
+        }
     }
 
-    .sidebar {
+    .sidebar:not(.is-open) {
         width: 50px;
         max-width: 100% !important;
 
+        .sidebar-sticky {
+            width: 50px;
+            max-width: 100% !important;
+        }
+
         .nav {
             padding-left: 0;
         }

src/core/Resources/assets/js/admin.js

@@ -27,3 +27,4 @@ require('./modules/file-manager.js')()
 require('./modules/file-picker.js')()
 require('./modules/analytics.js')()
 require('./modules/page.js')()
+require('./modules/sidebar.js')()

src/core/Resources/assets/js/modules/sidebar.js

@@ -0,0 +1,9 @@
+const $ = require('jquery')
+
+const SidebarOpener = () => {
+  $('.sidebar-toggler .btn').click(() => {
+    $('.sidebar').toggleClass('is-open')
+  })
+}
+
+module.exports = SidebarOpener

src/core/Resources/views/admin/layout.html.twig

@@ -34,6 +34,12 @@
         {% block body_container %}
             <div class="container-fluid">
                 <nav class="bg-dark-blue sidebar">
+                    <div class="sidebar-toggler">
+                        <button class="btn">
+                            <span class="fa fa-bars"></span>
+                        </button>
+                    </div>
+
                     <div class="sidebar-sticky">
                         {{ include('@Core/admin/module/menu.html.twig') }}
                     </div>

src/core/Resources/views/admin/module/menu.html.twig

@@ -1,5 +1,3 @@
-{% import "@Core/admin/macros/menu.html.twig" as macros_menu %}
-
 <ul class="nav flex-column">
     {{ include('@Core/admin/module/_menu_item.html.twig', {
         id: 'dashboard',