Replace notifications Javascript code by CSS

ChangeLog

@@ -5,6 +5,7 @@ Improvements:
 
 * Add button to close inline popups
 * Simplify `.htaccess` to avoid potential issues with possible specific Apache configurations
+* Replace notifications Javascript code by CSS
 
 Breaking changes:
 

assets/js/src/Notification.js

@@ -1,9 +0,0 @@
-Kanboard.Notification = function(app) {
-    this.app = app;
-};
-
-Kanboard.Notification.prototype.execute = function() {
-    $(".alert-fade-out").delay(4000).fadeOut(800, function() {
-        $(this).remove();
-    });
-};

assets/sass/_alert.sass

@@ -48,3 +48,11 @@
   border-width: 1px 0 0
   border-radius: 4px 4px 0 0
   z-index: 9999
+  opacity: 1
+  animation: fadeout 5s linear forwards
+
+@keyframes fadeout
+  0%
+    opacity: 1
+  100%
+    opacity: 0