Add multiple choice questions in textbook to check understanding?

[ttimbers]

We just received some excellent feedback from @RohanAlexander on the book, and one idea is too large in scope to make it into v1, but I think we should consider it for v2 of the book:

Exercises are provided as a link to Jupyter notebook. While the authors
have done this to provide a certain type of assessment, it would be
nice to additionally have some more-traditional questions included in
the text to enable quick knowledge-checks with less friction. For
instance, even just 10-20 MCQ in the book following each chapter
about key concepts in that chapter could be useful.