Conda dependencies

[Dhananjhay]

This PR removes the equivolume logic from the laminar coordinate method, effectively eliminating hippunfold's dependency on the nighres package. This change serves as a stepping stone toward synchronizing and integrating hippunfold with the conda environment.

[Dhananjhay]

@akhanf I've only removed equivolume as a choice from the config/snakebids.yml but I was wondering If I should clean the code-base more extensively. For example, I believe we no longer need scripts/equivolume_coords.py and scripts/pre_equivolume_coords.pyand the relevant logic in wraps.smk, common.smk and autotop.smk. Moreover, I can edit algorithms.md and pipeline.md to reflect that equivolume is no longer offered as a choice in laminar_coords_method.

[akhanf]

We haven't decided yet what route we will take so no need to clean up yet. But this should at least allow you to progress on the pure conda hippunfold