fix more broken markdown links

Fixed stuff we broke by mistake, previously.

Ran `make www` to perform the above.

TODO: Fix stuff we broke by mistake doing the above.

TODO: Fix more broken markdown links.

2019/dogon/index.html

@@ -410,7 +410,7 @@ Location: <a href="../../location.html#IL">IL</a> - <em>State of Israel</em> (<e
 <p>Make sure that you keep focus of windows in mind when going back and forth to
 the program and the script.</p>
 <h2 id="judges-remarks">Judges’ remarks:</h2>
-<p><a href="../..//1991/davidguy/index.html">1991/davidguy</a>,
+<p><a href="../../1991/davidguy/index.html">1991/davidguy</a>,
 <a href="../../2011/blakely/index.html">2011/blakely</a>, …</p>
 <p>…This entry likely concludes the IOCCC category “Cellular automata simulators”;
 it would be very hard to beat it on its field.</p>