many dns changes

hosts/elros/links.nix

hosts/elros/strongswan.nix

hosts/gimli/default.nix

hosts/gimli/links.nix

hosts/thrain/links.nix

hosts/thrain/network/dns.nix

hosts/vaire/links.nix

hosts/varda/links.nix

hosts/varda/wireguard.nix

lib/vpn/thrain.cert.pem

modules/kloenk/default.nix

modules/kloenk/nginx.nix

modules/kloenk/strongswan/bird.conf

modules/kloenk/strongswan/default.nix

modules/kloenk/syncthing.nix

modules/kloenk/vpn.nix

profiles/telegraf.nix

secrets/thrain.yaml

services/int-acme-ca/default.nix

services/knot-dns/primary/default.nix