add links to download rules and guidelines

next/rules.html

@@ -464,6 +464,10 @@ writing by <a href="../contact.html">contacting the judges</a>.</p>
 <p class="leftbar">
 These <a href="rules.html">IOCCC rules</a> are version <strong>28.15 2024-12-28</strong>.
 </p>
+<p class="leftbar">
+The <a href="rules.md" download="rules.md">markdown form of these rules</a>
+is available for download.
+</p>
 <p><strong>IMPORTANT</strong>: Be sure to read the <a href="guidelines.html">IOCCC guidelines</a>.</p>
 <p>Jump to: <a href="#">top</a></p>
 <div id="change_marks">