feat(config): initial

Based on `cce47e4df5/standard`
Adds (experimental) support for `nix-on-droid` and `nix-on-darwin`
Includes support for multiple hosts of each base
Adds config for `cheetah` on `nix-on-droid`

nix-on-droid/cheetah/configuration.nix

@@ -0,0 +1,31 @@
+{ inputs, outputs, lib, config, pkgs, ... }:
+
+{
+  environment.packages = with pkgs; [];
+
+  # Backup etc files instead of failing to activate generation if a file already exists in /etc
+  environment.etcBackupExtension = ".bak";
+
+  # Remove motd
+  environment.motd = null;
+
+  # # Set $EDITOR
+  # environment.variables.EDITOR = "nvim";
+
+  # Read the changelog before changing this value
+  system.stateVersion = "22.05";
+
+  nix.extraOptions = ''
+    experimental-features = nix-command flakes
+  '';
+
+  time.timeZone = "Europe/Sofia";
+
+  home-manager = {
+    config = ./home.nix;
+    backupFileExtension = "hm-bak";
+    useGlobalPkgs = true;
+
+    # extraOptions = { inherit inputs; };
+  };
+}