[ENH] Keep up with fMRIPrep's infrastructure

[GalKepler]

I think it's been a while since this repository was initiated to mimic the infrastructure of fMRIPrep. Since then, fMRIPrep was updated and upgraded several times. I believe that to keep this package up-to-date with fMRIPrep's infrastructure, a major PR is requested.

Updating the infrastructure will facilitate general maintenance efforts and improve general functionality.