modularized all the things

part one (?)

modules/machine/cloud/README.md

@@ -7,3 +7,7 @@ Licensed by the Mozilla Public License v2
 ## Synopsis
 
 This directory is where the machine-specific configuration files for hostname `cloud` live, my primary desktop. These files get called by the root `flake.nix` file.
+
+### `TODO` list
+
+- Migrate to (disko)[https://github.com/nix-community/disko]