fix duplicate footnotes in 2005/persano/index.html

2005/persano/README.md

@@ -156,8 +156,6 @@ smoother by increasing the number of polygons.
 [π](https://en.wikipedia.org/wiki/Pi) in the code.
 
 
-### FOOTNOTES
-
 [^1]: You can call such a transformation an "ambient isotopy" if you want to
 impress people at parties.
 

2005/persano/index.html

@@ -236,7 +236,6 @@ smoother by increasing the number of polygons.</p></li>
 <li><p>(5 points) Locate the famous transcendental constant
 <a href="https://en.wikipedia.org/wiki/Pi">π</a> in the code.</p></li>
 </ol>
-<h3 id="footnotes">FOOTNOTES</h3>
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