networks: Implement configuring a remote front server

• Implement configuration as show in reachability UX (#1531) slide 16
• Connect to remote server via SSH
• Issue commands to check basic sanity (Debian GNU/Linux server, has internet access etc.)
• Issue commands to install wireguard
• Issue commands to setup wireguard and obtain keys
• Issue commands to setup iptables to forward all traffic on the VPN connection
  • Ensure that SSH traffic is not hurt.
• Configure local WireGuard to connect to remote server.
• Implement a button in the Networks page to launch the remote front configuration.