Please explain the usecase for all these files in files/, are they not part of upstream?

Those are config files and their manpages explaining how to configure them. I think they are not part of the upstream git repository because i couldn't find them there, but i found them both in fedora package and arch package (that's where i got them from). I just noticed that seccomp.json is also provided by podman package (but on different path) so i will see if i can remove it. I know that registries.conf is definitely needed but we probably don't need manpage for it. I will dig a bit more about what we must keep and what i can just remove.