Fix source code link

src/index.html

@@ -66,7 +66,7 @@
                 <ul>
                     <li><b><a href="https://git.eisfunke.com/software/mock">Mock</a>:</b> A command line program to transform text.</li>
                     <li><b><a href="https://git.eisfunke.com/software/mock-telegram-bot">Mock (Telegram bot)</a>:</b> Telegram bot integration for Mock.</li>
-                    <li><b><a href="https://git.eisfunke.com/web/online-lenz.de">online-lenz.de</a>:</b> The source code of this page.</li>
+                    <li><b><a href="https://git.eisfunke.com/doc/online-lenz.de">online-lenz.de</a>:</b> The source code of this page.</li>
                     <li><b><a href="https://git.eisfunke.com/research/katrin">Katrin</a>:</b> Ideas and work on a compiler for an innovative, dependently-typed functional programming language.</li>
                 </ul>
             </div>