These targets allow one experiment to directly refer to another
experiment results, thus a dependency chain can be formed to ensure
execution order.
It also simplifies the dataset definition, as they can be automatically
fetched from the experiment directly.
- All garlic stuff is moved into garlic/
- Group the overlay index by sections
- Add a garlic/default.nix link to the main default.nix, so we can
build derivations at garlic/
