change inventory layout for year level index.html files

The "Jump to top" in the inventory section of an entry index.html file
now is below the secondary file list, with a short line above it.

Changed `bin/output-year-index.sh` VERSION from "1.3 2024-04-15"
to "1.4 2024-04-21".

Run `make gen_year_index` to perform the above.

1993/index.html

@@ -220,7 +220,10 @@ to serve as official taste testers. And as usual, the food was excellent.</p>
 <li><a href="schnitzi/index.html">1993/schnitzi</a> - Obfuscated Intelligence Award</li>
 <li><a href="vanb/index.html">1993/vanb</a> - Most Irregular Expression</li>
 </ul>
-<p> <strong>Jump to:</strong> <a href="#">top</a></p>
+<hr style="width:10%;text-align:left;margin-left:0">
+<h4>
+Jump to: <a href="#">top</a>
+</h4>
 
 <!-- END: next line ends content generated by: bin/output-year-index.sh -->