Beginnings of config for Darwin machines

Split out a platforms/ directory with a linux.nix and darwin.nix, and
starting splitting things out between the two

home/machines/chupacabra.nix

@@ -2,6 +2,13 @@
 let
   laptopKeyboardId = "25";
 in {
+  imports = [
+    ../platforms/linux.nix
+
+    ../modules/common.nix
+    ../modules/games.nix
+  ];
+
   system.machine = {
     wirelessInterface = "wlp59s0";
     i3FontSize = 9;

home/machines/dobharchu.nix

@@ -0,0 +1,17 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ../platforms/darwin.nix
+    ../modules/common.nix
+    ../modules/games.nix
+  ];
+
+  home.packages = with pkgs; [
+    coreutils
+    gnupg
+    nix-prefetch-github
+    pass
+    pinentry_mac
+  ];
+}