Explain that key material is auto-managed in the KASP keystore under
/var/lib/knot, and that the registrar DS is generated per zone with
`sudo -u knot keymgr <zone> ds`.
Docs live in docs/ (DNS, ZeroTier mesh, monitoring), built at Nix-build time and
served as static files over the ZeroTier mesh on control:8080. Commit-to-edit:
change the markdown and redeploy to publish.
Berwn