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.
Move become: true into zigbee2mqtt role
Remove become: true from deploy_public_reverse_proxy playbook
Remove become: true from deploy_dokuwiki playbook
Move become: true from deploy_audio_pi and deploy_light playbooks into roles
Remove become: true from deploy_keycloak playbook
Move become: true from deploy_automation playbook to mosquitto role