Add Nix flake configuration

hosts/atlas/README.md

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+# Atlas
+
+## Overview
+A general purpose mini computer used for web browsing and multimedia.
+
+## Specs
+* CPU - Intel Core i7-4790K @ 4.00GHz
+* Memory - 8 GB DDR3
+* Motherboard - ASRock Z97M-ITX
+* GPU - AMD Radeon R9 290X 4GB
+
+### Disks
+Device | Partitions _(filesystem, usage)_
+--- | ---
+Samsung SSD 850 | `/dev/sda1` (NTFS, Windows XP)
+Samsung SSD 850 | `/dev/sdb1` (EFI, NixOS Boot) <br> `/dev/sdb2` (ext4, NixOS Root)
+
+### Networks
+DHCP on `10.0.1.0/24` subnet.

hosts/atlas/default.nix

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+{ 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;
+    };
+  };
+}

hosts/atlas/hardware-configuration.nix

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+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "ehci_pci" "ahci" "usbhid" "usb_storage" "sd_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" "wl" ];
+  boot.extraModulePackages = [ config.boot.kernelPackages.broadcom_sta ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/db92d689-50d4-4301-90f9-122aab198e38";
+      fsType = "ext4";
+    };
+
+  fileSystems."/boot/efi" =
+    { device = "/dev/disk/by-uuid/0720-9BE0";
+      fsType = "vfat";
+    };
+
+  swapDevices =
+    [ { device = "/dev/disk/by-uuid/fb217be3-c5df-4e70-8032-78bfbe7325cb"; }
+    ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp0s25.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+  # high-resolution display
+  hardware.video.hidpi.enable = lib.mkDefault true;
+}