index.php: add fadderuke 2025 poster

www/index.php

@@ -109,6 +109,8 @@ $doorTime = date('H:i', $doorEntry->time);
 		</div>
 
 		<div class="gridl">
+      <img src="/sosiale/fadderuke-2025.png" width="100%">
+      <br>
 			<?php
         $title = $motd['title'];