In a terminal, install now asks for the domain, Let's Encrypt email,
endpoint, WireGuard port and admin password, shows a summary and changes
nothing until confirmed. Re-runs offer the current settings and say how
many devices need a new config when the endpoint or port changes.
Flags still work and skip their question; -y or no terminal skips all
questions. New -port flag sets the WireGuard UDP port. Every value is
checked before the system is touched.
Daniel Redetzke