Update "In use" list

A few of those sites have switched theme or 404 now
textbook · Apr 29, 2019 · fa3b79f · fa3b79f
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@@ -216,9 +216,6 @@ Here are few current users of Bulrush (or modified versions of it):
  - [textbook](http://blog.jonrshar.pe/)
  - [Simon Says](https://simonsays.neocities.org/)
  - [CodeRobot](http://coderobot.downley.net/)
- - [chair6.net](http://chair6.net/)
- - [Just Numbers and Things](http://justnumbersandthings.com/)
- - [بلاگ باهم](https://baaham.net/blog/) (in Persian!)
  - [Small Data](https://smalldata.dev/about.html)
 
 If you'd like to be featured here (or are and would prefer not to be), feel