Remove @rossabaker as moderator

This isn't DRY with typelevel/.github#7

Author: rossabaker

_includes/code-of-conduct.html

@@ -67,7 +67,6 @@
   them, or
 * send an e-mail to one of the following general moderators if you want to
   choose who you are talking to:
-  * [Ross A. Baker](mailto:ross@rossabaker.com)
   * [Christopher Davenport](mailto:chris@chrisdavenport.tech)
   * [Kailuo Wang](mailto:kailuo.wang@gmail.com)