Update the documentation

[mwouts]

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

[github-actions[bot]]

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 :white_check_mark:

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

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #321 +/- ## ======================================= Coverage 93.65% 93.65% ======================================= Files 28 28 Lines 1339 1339 ======================================= Hits 1254 1254 Misses 85 85 ``` | [Flag](https://app.codecov.io/gh/mwouts/itables/pull/321/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/mwouts/itables/pull/321/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts) | `93.65% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts#carryforward-flags-in-the-pull-request-comment) to find out more.

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