Clone this repository into /etc/dotfiles:

sudo git clone https://github.com/sei40kr/dotfiles.git /etc/dotfiles
sudo chown -R $USER /etc/dotfiles
ln -fs /etc/dotfiles ~/.dotfiles

Move to /etc/dotfiles

cd /etc/dotfiles

Build and switch to the configuration:

sudo nixos-rebuild switch --flake ".#${HOST}"

Once you switch to the configuration, you can use nh to update the system (you may need to re-login before using nh):

nh os switch