- Separate `lmn_vpn` from `lmn_teacherlaptop`.
- Implement a check for the availability of the wireguard-server during the wg-config rollout.
- Enhance variable support with a standardized naming schema:
- VPN selection via `vpn` variable (`none`, `wg`).
- Wireguard configuration (endpoint, allowed IPs, ip_cdr, dns, searchpath).
- Run wg-config role in separate play with serial 1 to avoid conflicts, when the role attempts
to determine the next free Wireguard IP on the server when role try to Add a check to verify if the radius certificate is revoked.
- Ensure required packages and services are only installed and configured if the `vpn` variable is set.
- Provide documentation for `lmn_vpn` module.
