improve layout of 1984/laman/index.html

Fixed code block.

Run `bin/readme2index.sh -v 1 1984/laman` to perform the above.

2000/thadgavin/index.html

@@ -253,7 +253,6 @@ less than dazzling. We could not test this entry in DOS mode.</p>
 <div id="inventory">
 <h1 id="inventory-for-2000thadgavin">Inventory for 2000/thadgavin</h1>
 </div>
-<p><a href="#top">Jump to top</a></p>
 <h2 id="primary-files">Primary files</h2>
 <ul>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/thadgavin/thadgavin.c">thadgavin.c</a> - entry source</li>
@@ -270,6 +269,10 @@ less than dazzling. We could not test this entry in DOS mode.</p>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2000/thadgavin/.path">.path</a> - directory path from top directory</li>
 <li><a href="index.html">index.html</a> - this web page</li>
 </ul>
+<hr style="width:10%;text-align:left;margin-left:0">
+<h4>
+Jump to: <a href="#">top</a>
+</h4>
 
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