TLDR: LUNI has been dead for years, go visit https://lusprojects.github.io
As of today, all repositories in the LUNIServer GitHub organization are read-only archives. This has been long overdue as the community around restoration of LU has left LUNI behind a few years ago.
I don’t really have the time or incentive to write a full post-mortem here. The GitHub org is the only LUNI-related platform that I (Xiphoseer) set up and thus the only one that I can shut down.
If you are interested the backstory of this particular project, ping me on LUCH (linked here). But if you are really just interested in LU restoration projects, have a look at the current ones and come hang around on Discord.