The user side is configured in /home/<user>.
To set up a user configuration it must be declared in
/modules/base/users/options.nix and /modules/base/users/<user>.nix can be
used for anything that is not preconfigured by
/modules/base/users/mkusers.nix. You will also want to add a hashed password
generated from mkpasswd to /modules/nixos/users/<user>.nix.
You should also add your user into the users.nix file for your system. Whilst
following the template:
{
garden.system = {
mainUser = "kitty";
users = [ "kitty" ];
};
# you can add a home-manager configuration here for the user if it needs
# anything special
home-manager.users.kitty.garden = {};
}