add footer with contact and discord to editor page

Author: pepc84

editor/index.html

@@ -221,6 +221,7 @@
   if ((e.ctrlKey||e.metaKey) && e.key==='Enter') { e.preventDefault(); runSketch(); }
 });
 </script>
+<footer><p>C++ Mode for Processing</p><p class="footer-contact"><a href="mailto:pep84c@gmail.com">pep84c@gmail.com</a> &middot; <a href="https://discord.gg/vShSrPegJT">Discord</a></p></footer>
 <script src="../assets/nav.js"></script>
 </body>
 </html>