Improve bin/output-year-index.sh

Make it consistent with my improvement to bin/gen-years.sh: the entry
awards in the links (to each entry) are now in bold and so are the link
names. This helps them stand out a bit more.

1990/index.html

@@ -435,17 +435,17 @@ See also <a href="../faq.html">the IOCCC FAQ</a> for additional information on t
 </div>
 <p><a href="1990.tar.bz2"><strong>Download all winning entries from 1990</strong></a></p>
 <ul>
-<li><a href="baruch/index.html">1990/baruch</a> - Best small program</li>
-<li><a href="cmills/index.html">1990/cmills</a> - Best game</li>
-<li><a href="dds/index.html">1990/dds</a> - Best language tool</li>
-<li><a href="dg/index.html">1990/dg</a> - Best abuse of the C preprocessor</li>
-<li><a href="jaw/index.html">1990/jaw</a> - Best entropy-reducer</li>
-<li><a href="pjr/index.html">1990/pjr</a> - Most unusual data structure</li>
-<li><a href="scjones/index.html">1990/scjones</a> - ANSI Committee’s worst abuse of C</li>
-<li><a href="stig/index.html">1990/stig</a> - Strangest abuse of the rules</li>
-<li><a href="tbr/index.html">1990/tbr</a> - Best utility</li>
-<li><a href="theorem/index.html">1990/theorem</a> - Best of Show</li>
-<li><a href="westley/index.html">1990/westley</a> - Best layout</li>
+<li><a href="baruch/index.html"><strong>1990/baruch</strong></a> - <strong>Best small program</strong></li>
+<li><a href="cmills/index.html"><strong>1990/cmills</strong></a> - <strong>Best game</strong></li>
+<li><a href="dds/index.html"><strong>1990/dds</strong></a> - <strong>Best language tool</strong></li>
+<li><a href="dg/index.html"><strong>1990/dg</strong></a> - <strong>Best abuse of the C preprocessor</strong></li>
+<li><a href="jaw/index.html"><strong>1990/jaw</strong></a> - <strong>Best entropy-reducer</strong></li>
+<li><a href="pjr/index.html"><strong>1990/pjr</strong></a> - <strong>Most unusual data structure</strong></li>
+<li><a href="scjones/index.html"><strong>1990/scjones</strong></a> - <strong>ANSI Committee’s worst abuse of C</strong></li>
+<li><a href="stig/index.html"><strong>1990/stig</strong></a> - <strong>Strangest abuse of the rules</strong></li>
+<li><a href="tbr/index.html"><strong>1990/tbr</strong></a> - <strong>Best utility</strong></li>
+<li><a href="theorem/index.html"><strong>1990/theorem</strong></a> - <strong>Best of Show</strong></li>
+<li><a href="westley/index.html"><strong>1990/westley</strong></a> - <strong>Best layout</strong></li>
 </ul>
 <hr style="width:10%;text-align:left;margin-left:0">
 <h4>