Automatically creates an admin account with sops data. Not my favorite
process because user needs to know to change the sops password to be
owned by forgejo, otherwise good though.
Has a bunch of useful config settings for setting up a server easily.
Commit with that to follow.
Point of worry: SSH_PORT setting isn't set, and will probably need to be
set later to allow people to commit and similar to the repos.
adds a new specialArg to hosts: usernameList, which is a list of users
determined through user/user.nix in the host/hostname dir.
This touches syncthing, tuigreet, jibril, shells, and system
removes the user.name field, and converts user.timezone to
system.timezone. This is to move user content off of the host.
This old system is replaced with dynamic user creation based on the
usernameList variable
Because this removes the users.users.defaultUser shells now use the
(more appropriate) users.defaultUserShell
