fix broken markdown local links in 2005/README.md

Ran `make gen_year_index` to perform the above.

2005/index.html

@@ -419,7 +419,7 @@ parenthesis</a> is self reproducing).</p></li>
 with the <a href="https://en.wikipedia.org/wiki/Vi">vi editor</a>.</p></li>
 <li><p>The <a href="chia/index.html">Most ambiguous language - 2005/chia</a> entry is really a C program.</p></li>
 <li><p>The <a href="boutines/index.html">Most superfluous output - 2005/boutines</a> entry is simply
-<a href="Voronoi">Voronoi</a>-lific!</p></li>
+<a href="https://en.wikipedia.org/wiki/Voronoi_diagram">Voronoi</a>-lific!</p></li>
 <li><p>Try not to have your sense of good coding offended by the <a href="timwi/index.html">Most
 discourteous interpreter - 2005/timwi</a> entry.</p></li>
 <li><p>The <a href="mynx/index.html">Best use of the www - 2005/mynx</a> doesn’t include those letters.</p></li>