Add link to mne-bids-pipeline

[skjerns]

PR Description

I would like to add a link to mne-bids-pipeline in the README. It's a very related project and currently not well linked yet.

Merge checklist

Maintainer, please confirm the following before merging.
If applicable:

• All comments are resolved
• This is not your own PR
• All CIs are happy
• PR title starts with [MRG]
• whats_new.rst is updated
• New contributors have been added to CITATION.cff
• PR description includes phrase "closes <#issue-number>"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.47%. Comparing base (fba8609) to head (479f68e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1328   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files          40       40           
  Lines        8876     8876           
=======================================
  Hits         8652     8652           
  Misses        224      224           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sappelhoff]

Good point! Thank you!