place entry index.html at the bottom of secondary inventory

2013/birken/index.html

@@ -585,7 +585,6 @@ Brothers 2, Nintendo, 1987.</p></li>
 <h2 id="secondary-files">Secondary files</h2>
 <ul>
 <li><a href="2013_birken.tar.bz2">2013_birken.tar.bz2</a> - download entry tarball</li>
-<li><a href="index.html">index.html</a> - this web page</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/birken/README.md">README.md</a> - markdown source for this web page</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/birken/.entry.json">.entry.json</a> - description of entry in JSON</li>
 <li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2013/birken/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
@@ -607,6 +606,7 @@ Brothers 2, Nintendo, 1987.</p></li>
 <li><a href="platform2.gif">platform2.gif</a> - stages of 5 red squares above a row of 3 red squares</li>
 <li><a href="triple0.gif">triple0.gif</a> - stages of constructed of rectangular regions</li>
 <li><a href="triple1.gif">triple1.gif</a> - stages of constructed of rectangular regions</li>
+<li><a href="index.html">index.html</a> - this web page</li>
 </ul>
 
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