TrialnError [1] filed a deletion request for panel-git [2]:
User vanished from Github, so the source is gone
There is an another repo for a lemonbar wrapper with the same name,
but comparing the build instructions they're not the same (file wise)
So unless someone wants to adjust the PKGBuild this can in my opinion
be nuked
[1] https://aur.archlinux.org/account/TrialnError/
[2] https://aur.archlinux.org/pkgbase/panel-git/