Keep the actual IP(s) of the server(s) secret

[JMLX42]

As of today, the actual IP of the Scaleway VM is actually stored in the repository. It defeats the whole point of using CloudFlare: attackers can directly target the IP of any of our servers.

Those IPs must be kept secret.

• Remove any public IP address from the code base.
• Swap any public IP for a new one.
• Pass any public IP to Ansible using secrets (Ansible Vault?).