add element updates

backend/app/Element/UpdateElementDto.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Element;
+
+class UpdateElementDto
+{
+    public function __construct(
+        public string $title,
+        public string $description,
+        public ?string $iconImageUrl,
+        public string $richText,
+        public ?string $pdfPath,
+        public ?string $youtubeUrl,
+    ) {
+    }
+}