Remove Brimir

The repository has been archived and the link to install/download is dead.

README.md

@@ -1321,7 +1321,6 @@ See https://staticsitegenerators.net and https://www.staticgen.com
 
 *See also [Task management/To-do lists](#task-managementto-do-lists) and [Project Management](#project-management)*
 
-- [Brimir](https://getbrimir.com/) - Simple and clean open-source ticket manager written in Ruby on Rails. ([Source Code](https://github.com/ivaldi/brimir)) `AGPL-3.0` `Ruby`
 - [Bugzilla](https://www.bugzilla.org/) - General-purpose bugtracker and testing tool originally developed and used by the Mozilla project. `MPL-2.0` `Perl`
 - [Bumpy Booby](http://bumpy-booby.derivoile.fr/) - Simple, responsive and highly customizable PHP bug tracking system. ([Source Code](https://github.com/piero-la-lune/Bumpy-Booby)) `MIT` `PHP`
 - [Cerb](http://www.cerberusweb.com/) - Group-based e-mail management project. ([Source Code](https://github.com/wgm/cerb)) `DPL` `PHP`