The BIDS conversion page contained a mix of general statements and
fine details (reflecting open discussions at the time of writing).
Now, considering the "less is more" principle, the introduction is
kept, but the other sections are changed to communicate the following:
- selected tooling (heudiconv / dcm2niix), what id does
- shared resources (public repos, reused across sites)
- DataLad layout of a BIDS dataset (what subdatasets and why)