Update astounding.md

Removing outdated now-nonexistent web link

Author: astounding

users/astounding.md

@@ -10,4 +10,3 @@ Aaron D. Gifford is astounding, and also in love with Ruby, using it daily for s
 -   [blog](http://www.aarongifford.com/yakkity/)
 -   [github](https://github.com/astounding)
 -   [Author of the mtik gem, a Ruby implementation of MikroTik's RouterOS API](http://www.aarongifford.com/computers/mtik/index.html)
--   [stgeorge.rb web site](http://stgeorgerb.org/)