change years.html#entry_id links to entry's index.html page

2019/index.html

@@ -159,8 +159,10 @@ a way it produces its own text!</p>
 <p>The <a href="ciura/index.html">“Most likely to be awarded” (ciura)</a> has an amazing
 vocabulary!</p>
 <p>There are again nods to entries of the years:</p>
-<pre><code>[1991/davidguy](../years.html#1991_davidguy)
-[2011/blakely](../years.html#2011_blakely)</code></pre>
+<ul>
+<li><a href="../1991/davidguy/index.html">1991/davidguy</a></li>
+<li><a href="../2011/blakely/index.html">2011/blakely</a></li>
+</ul>
 <p>These nods to not run afoul of the guideline:</p>
 <pre><code>    We tend to dislike programs that:
     ...