Remove f2b gateway bouncer

To be replaced by something more sensible

ansible/host_vars/casey/main.yml

@@ -1,6 +1,5 @@
 nebula_is_lighthouse: true
 nebula_listen_port: "{{ nebula_lighthouse_port }}"
-ssh_extra_allowed_users: f2b@{{ nebula.cidr }} f2b@{{ pve_hosts.internal_cidr }} f2b@{{ tailscale_cidr }}
 
 nginx_https_redirect: true