chore: update footer copyright to 2026

Author: molty3000

docs/index.html

@@ -635,7 +635,7 @@ <h4>📁 Static Files</h4>
       <a href="https://www.npmjs.com/package/restana" target="_blank">npm</a>
       <a href="https://21no.de/" target="_blank">21no.de</a>
     </div>
-    <p>Open source under the MIT License. © 2025 <a href="https://21no.de/">21no.de</a></p>
+    <p>Open source under the MIT License. © 2026 <a href="https://21no.de/">21no.de</a></p>
   </div>
 </footer>