new: add `duplicate` button for articles

resources/views/layout/index.blade.php

@@ -94,6 +94,18 @@
 
     @stack('scripts')
     @stack('js')
+    <script>
+        document.addEventListener('DOMContentLoaded', function() {
+            document.querySelectorAll('.form-buttons .duplicate').forEach(function(btn) {
+                btn.addEventListener('click', function() {
+                    var url = this.dataset.url || this.getAttribute('data-url');
+                    if (url) {
+                        window.location = url;
+                    }
+                });
+            });
+        });
+    </script>
 
 </body>