Hello Andy. I guess you are speaking of Guix Home <https://guix.gnu.org/en/manual/devel/en/html_node/Home-Configuration.html>?
We cannot advertise it at the top of the homepage yet, since it was still experimental at the time of the last release (1.4.0) and is only stable after first doing a “guix pull”. Or do you mean there should be documentation on how to set up systemd to start Guix Home at system startup? Guix Home gets started at user log-in normally, but a root-level systemd unit could start it at boot somehow. Regards, Florian