Move from `hhd-dev/rechunk` to `ublue-os/legacy-rechunk`

We are going to switch Bluefin+LTS and Aurora to this instead of `hhd-dev/rechunk`, here are their tracking issues:

- https://github.com/ublue-os/aurora/issues/1468
- https://github.com/ublue-os/bluefin/issues/3852