There are many like it but these are mine.
Okay but hear me out, they're actually pretty nifty. These dotfiles configure all my computers, desktops and servers alike. Mostly it's just a bunch of nix, the specific config is determined by the hostname (through the power of flakes!) with individual host configs under /hosts.
To actually get this whole thing installed from a live image ya wanna go through the regular nixos install steps BUT run
sudo nixos-install --flake /mnt/etc/nixos#<hostname>
when it's time to build the system.