The current crystal binary in nixpkgs complains about not finding pcre
when you try to compile anything with it, so crystal-flake is necessary
to have a working crystal environment under NixOS.
crystal-flake additionally packages crystalline, which is nice since no
one has been able to successfully create a pull request for nixpkgs yet.
Reference: https://github.com/NixOS/nixpkgs/issues/129002
Stylix is like a maintained version of pywal but configuration changes
are managed by Nix and Home Manager, thus guaranteeing a certain level
of reproducibility with its declarative nature.
