feat(flake): add initial nix-on-droid configuration

system/hosts/ooksphone/default.nix

@@ -0,0 +1,46 @@
+{ config, lib, pkgs, ... }:
+
+{
+  # Simply install just the packages
+  environment.packages = with pkgs; [
+    # User-facing stuff that you really really want to have
+    helix # or some other editor, e.g. nano or neovim
+    git
+    killall
+    hostname
+    man
+    coreutils
+  ];
+
+  environment.etcBackupExtension = ".bak";
+
+  system.stateVersion = "23.11";
+
+  nix.extraOptions = ''
+    experimental-features = nix-command flakes
+  '';
+
+  time.timeZone = "Pacific/Auckland";
+
+  user = {
+    userName = "ooks";
+    home = "/data/data/com.termux.nix/files/ooks/home";
+    shell = "${pkgs.fish}/bin/fish";
+  };
+
+  # Configure home-manager
+  home-manager = {
+    backupFileExtension = "hm-bak";
+    useGlobalPkgs = true;
+
+    config =
+      { config, lib, pkgs, ... }:
+      {
+        imports = [ ../../../home/modules/console/editor ];
+
+        homeModules.home.console.editor.helix.enable = true;
+
+        home.stateVersion = "23.11";
+      };
+  };
+}