`nested_dft` needs refactored to merge/use functionality of `relaxation.vasp.staged` [`RelaxationRelaxationStaticBase`](https://github.com/jacksund/simmate/blob/main/src/simmate/apps/warren_lab/workflows/nested_dft/double_relaxation_static_base.py) is really a copy of [`Relaxation__Vasp__Staged`](https://github.com/jacksund/simmate/blob/main/src/simmate/apps/vasp/workflows/relaxation/staged.py) with not as many features/functionality