acp menu - accordion effect

public/less/admin/admin.less

@@ -29,6 +29,15 @@
 
 		.sidebar-nav {
 			margin-top: 1px;
+			overflow: hidden;
+			.transition(.4s ease-in-out height);
+			height: 250px;
+			max-height: 100%;
+			cursor: pointer;
+
+			&.closed {
+				height: 38px;
+			}
 
 			.nav-header {
 				color: #fff;

public/src/forum/admin/footer.js

@@ -26,7 +26,15 @@ define('forum/admin/footer', ['forum/admin/settings'], function(Settings) {
 		$(window).on('action:ajaxify.end', function() {
 			setupPills();
 		});
+
+		setupMainMenu();
+	});
+
+	function setupMainMenu() {
+		$('.sidebar-nav').on('click', function() {
+			$(this).toggleClass('closed');
 		});
+	}
 
 	function setupPills() {
 		$('.navigation.nav-pills li').removeClass('active');