Restructure Darwin configuration

So far, this is just based on mightymac. The other devices will be
updated soon.

modules/hosts/darwin/default.nix

@@ -0,0 +1,131 @@
+{ pkgs, hostname, username, ... }: {
+  environment = {
+    shells = with pkgs; [ bash zsh ];
+    pathsToLink = [
+      "/Applications"
+      "/share/zsh"
+    ];
+    systemPackages = with pkgs; [
+      age
+      bandwhich
+      coreutils
+      hugo
+      mas
+      nmap
+      openjdk
+      sops
+      ssh-to-age
+    ];
+  };
+
+  homebrew = {
+    enable = true;
+    onActivation = {
+      autoUpdate = true;
+      cleanup = "zap";
+      upgrade = true;
+    };
+    taps = [
+      "homebrew/cask-fonts"
+      "null-dev/firefox-profile-switcher"
+      "theseal/ssh-askpass"
+    ];
+    brews = [
+      "fastfetch"
+      "ffmpeg"
+      "firefox-profile-switcher-connector"
+      "ssh-askpass"
+      "telnet"
+    ];
+    casks = [
+      "1password"
+      "1password-cli"
+      "amethyst"
+      "angry-ip-scanner"
+      "appcleaner"
+      "audacity"
+      "balenaetcher"
+      "bartender"
+      #"displaylink"
+      "element"
+      "firefox"
+      "font-hack-nerd-font"
+      "font-inconsolata-g-for-powerline"
+      "font-source-code-pro-for-powerline"
+      "gitkraken"
+      "gitkraken-cli"
+      "handbrake"
+      "imageoptim"
+      "iterm2"
+      "keepingyouawake"
+      "libreoffice"
+      "logseq"
+      "makemkv"
+      "meld"
+      "MKVToolNix"
+      "nextcloud"
+      "onlyoffice"
+      "raycast"
+      "signal"
+      "slack"
+      "sonos"
+      "tailscale"
+      "visual-studio-code"
+      "vivaldi"
+      "zoom"
+    ];
+    masApps = {
+      "1Password for Safari" = 1569813296;
+      "BetterSnapTool" = 417375580;
+      "Brother iPrint&Scan" = 1193539993;
+      "Home Assistant" = 1099568401;
+      "MQTT Explorer" = 1455214828;
+    };
+  };
+
+  networking.hostName = "${hostname}";
+
+  nix = {
+    settings = {
+      bash-prompt-prefix = "(nix:$name)\040";
+      build-users-group = "nixbld";
+      experimental-features = [
+        "auto-allocate-uids"
+        "flakes"
+        "nix-command"
+      ];
+      # extra-substituters = [
+      # ];
+      # extra-trusted-public-keys = [
+      # ];
+      substituters = [
+        "https://cache.nixos.org" # default one
+        "https://cache.flox.dev"
+        "https://nixpkgs-terraform.cachix.org"
+      ];
+      trusted-public-keys = [
+        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" # default one
+        "flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs="
+        "nixpkgs-terraform.cachix.org-1:8Sit092rIdAVENA3ZVeH9hzSiqI/jng6JiCrQ1Dmusw="
+      ];
+      trusted-users = [ "@admin" "${username}" ];
+    };
+    extraOptions = ''
+      # Generated by https://github.com/DeterminateSystems/nix-installer, version 0.11.0.
+      extra-nix-path = nixpkgs=flake:nixpkgs
+      # Uncoment below after validation bug is fixed
+      #upgrade-nix-store-path-url = https://install.determinate.systems/nix-upgrade/stable/universal
+    '';
+  };
+
+  programs = {
+    zsh.enable = true;
+  };
+
+  services.nix-daemon.enable = true;
+
+  users.users.${username} = {
+    home = "/Users/${username}";
+    shell = pkgs.zsh;
+  };
+}