add IOCCC markdown to the About menu

nojs-menu.html

@@ -179,6 +179,12 @@
                 Thanks for the help
               </a>
             </div>
+
+            <div class="outfit-font">
+              <a href="./markdown.html" class="sub-item-link">
+                IOCCC markdown
+              </a>
+            </div>
           </div>
         </div>
       </div>
@@ -403,7 +409,8 @@
 <li><a href="index.html">IOCCC Home</a></li>
 <li><a href="contact.html">The IOCCC Judges</a></li>
 <li><a href="contact.html">Contacting the IOCCC</a></li>
-<li><a href="thanks-for-help.html">Thanks for the help</a>
+<li><a href="thanks-for-help.html">Thanks for the help</a></li>
+<li><a href="markdown.html">IOCCC markdown</a>
 <!-- AFTER: last line of markdown file: nojs-menu.md --></li>
 </ul>