Add `nixpkgs-cross-overlay` to substituters
Add `google-cloud-sdk` to `home.packages`
Remove comment (from old experiments) from `reo101-shell` HM module
Remove `pinentry-touchid` from `brew` packages (causing issues, no longer used)
Place all modules in either:
- `modules/${manager}/${module}.nix`
- `modules/${manager}/${module}/default.nix`
- `${manager}` - One of `nixos`, `nix-on-droid`, `nix-darwin` or `home-manager`
- `${module}` - Module name (autoimported by configurations, used for exporting)
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`