Easy Maintenance Mode for Tutor and Open edX.
A Tutor plugin that puts a “down for maintenance” page in front of an Open edX platform,
on demand, without needing to know every domain your other Tutor plugins have registered
with Caddy. `tutor maintenance on`/`off` hot-swap the running Caddy config through its
admin API, so the main Caddyfile is never patched.