rename index_old to zoom

index.html

@@ -28,7 +28,7 @@
         <li>
             <a href="https://git.xpub.nl/">git.xpub.nl: XPUB GIT repository</a></li>
         <li>
-            <a href="index_old.html">Wiki "Zoom" interface</a> (archive, last updated 2018)
+            <a href="zoom.html">Wiki "Zoom" interface</a> (archive, last updated 2018)
         </li>
     </ul>
 </body>