A macOS nix-darwin config

This repository now focuses on macOS systems managed with nix-darwin.

Started with a configuration generated from this nixos config templateInstalled nix with --nix-build-group-id 30000 Initialy created 'with secrets' but stripped out the git/agenix in favor of sops

Refactored the configuration to remove nixos but keep the shared modules and Darwin host setup, with no NixOS trees or Linux app targets.