[scikit-image] Docathon starting tomorrow

[Stefan van der Walt]

Hi, everyone

A reminder that the Docathon starts tomorrow, 6 March.  Please join us
by improving the documentation for your favorite function, adding an
example to the gallery, or helping with the docs tooling for
scikit-image.

https://bids.github.io/docathon/pages/projects/scikit-image.html

Please prefix all documentation commits with "DOC:" so that we can get
ahead in the leaderboard :)

Best regards
Stéfan