Major config overhaul: use custom modules, setup for multi-host config, and less boilerplate

hosts/snowfire/default.nix

@@ -0,0 +1,14 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ./configuration.nix
+    ./hardware-configuration.nix
+  ];
+
+  config = {
+    home-manager.users = builtins.listToAttrs
+      (map (user: { name = user; value = 
+                      ({ imports = [ ./home.nix ../../modules/user ]; });}) config.systemSettings.users);
+    };
+}