Convert home-manager to flakes

Instead of calling the home manager directly in the user's list, we add
a command for the user to invoke "hms" and have their environment setup
in the way that Greg likes.

home/default.nix

@@ -0,0 +1,35 @@
+{ nixpkgs, nurpkgs, home-manager, username ? builtins.getEnv "USER", ... }:
+
+let
+	homeDirectory = if username == "root" then "/root" else "/home/${username}";
+	configDir = "${homeDirectory}/.config";
+
+	pkgs = import nixpkgs {
+		config.allowUnfree = true;
+		config.xdg.configHome = configDir;
+		overlays = [
+			nurpkgs.overlay
+			(import ../overlays)
+		];
+	};
+
+	nur = import nurpkgs {
+		inherit pkgs;
+		nur = pkgs;
+	};
+
+	mkhome = system: gui:
+		home-manager.lib.homeManagerConfiguration rec {
+			inherit pkgs system username homeDirectory;
+			stateVersion = "22.05";
+			configuration = import ./home.nix username {
+				inherit nur pkgs gui;
+				inherit (pkgs) config lib stdenv;
+			};
+		};
+in {
+	"aarch64-gui" = mkhome "aarch64-linux" true;
+	"aarch64-nogui" = mkhome "aarch64-linux" false;
+	"x86_64-gui" = mkhome "x86_64-linux" true;
+	"x86_64-nogui" = mkhome "x86_64-linux" false;
+}