Fix aarch64, use coreutils, and use nixpkgs 25.11 directly

nix: Use coreutils instead of busybox

Allow manual hostname override

Major reorganization. Add nix-shell detection. Allow manual path symbolic shrinking.

Use nix flakes

Follow default nix build standards

Allow different prompt sizes

Allow red errors for root user

Show hostname if sudo, too

FQDNs bad

Get rid of test for generating hostname

If SSH or TMUX, show hostname; Always append newline, no zsh emulation by default

Add no new line ending detection and acknowledgements

Don't link directly to /bin/bash and sync history between terminals

Add nix build