We have a bunch of old hosts, host_vars and roles we no longer use.
There is no real value to keep them as they can just be fetched from the
git history, should they be needed again.
This make gettin a overview of the repository much simpler.
This makes a full deployment of all hosts easier and parallelises
execution of roles, which are used for multiple hosts.
You can still easily deploy only a subset of hosts using the -l flag for
ansible-playbook.