Add Nix flake configuration

hosts/atlas/default.nix

@@ -0,0 +1,45 @@
+{ config, lib, pkgs, ... }:
+
+with lib.my;
+{
+  imports = [
+    ./hardware-configuration.nix
+    ../desktop.nix
+  ];
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+  boot.loader.efi.efiSysMountPoint = "/boot/efi";
+
+  networking.hostName = "atlas";
+  networking.networkmanager.enable = true;
+
+  nix.package = pkgs.nixFlakes;
+  nix.extraOptions = ''
+    experimental-features = nix-command flakes
+  '';
+
+  users.defaultUserShell = pkgs.zsh;
+
+  system.stateVersion = "22.11";
+
+  modules = {
+    desktop = {
+      firefox.enable = true;
+    };
+    editors = {
+      neovim.enable = true;
+      vscode.enable = true;
+    };
+    security = {
+      gpg.enable = true;
+      pass.enable = true;
+    };
+    shell = {
+      fzf.enable = true;
+      git.enable = true;
+      nnn.enable = true;
+      zsh.enable = true;
+    };
+  };
+}