David Nicholson (https://t.co/qCaU5v7UrE) contributed https://t.co/Hsbrxvxu8u: DOC: Finish munging howto fixup, other clean-ups
- Remove doc/data/r6paq/b17_concat_dtw.TextGrid
because it's 11 MB and takes forever to load with
the new TextGrid class
- Fix toctree in doc/howto
David Nicholson (https://t.co/qCaU5v7UrE) contributed https://t.co/ZXJ30BicTP: MRG: #248 from vocalpy/all-contributors/add-rhine3
docs: add rhine3 as a contributor for userTesting, and ideas