Update the documentation

[mwouts]

• Install the widget dependencies
• Move the row selection to a new chapter

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: .

Also, the version of ITables developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/itables.git@update_documentation

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.65%. Comparing base (b6c9959) to head (61eb94b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
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  Coverage   93.65%   93.65%           
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  Files          28       28           
  Lines        1339     1339           
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  Hits         1254     1254           
  Misses         85       85           

Flag	Coverage Δ
	93.65% <ø> (ø)

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