docs: remove link to obsolete error handling section

thanks for the catch @jernst!

templates/docs.html

@@ -104,7 +104,7 @@
 <li><a href="#compare">How do the different protocols compare?</a></li>
 <li><a href="#translate">How are the different protocols translated?</a></li>
 <li><a href="#router">How are activities routed?</a></li>
-<li><a href="#error-handling">How are errors handled?</a></li>
+<!-- <li><a href="#error-handling">How are errors handled?</a></li> -->
 
 </ul>