Add info on standard processing pipelines that we recommend to use (whole brain, CN-V specific, anat, dwi, fmri, meg)

[djoerch]

• sections for
  • [ ] anat (smriprep)
  • [ ] dwi (qsiprep?, dwiprep)
  • [ ] fmri (fmriprep)
  • [ ] meg (mne, is there also a bids-app?)
• regard analysis scope
  • [ ] whole brain (see above tools for whole brain)
  • [ ] CN-V specific (mention existing atlases, otherwise, refer to our new code-repo for CN-V specific processing of dwi data + anat data)