Document how to use the ITable widget in Shiny for Python

[mwouts]

Plus, display two sample Shiny apps

Closes #276

[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@document_itable_widget_in_shiny

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.69%. Comparing base (a03d71c) to head (207c0b5).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #324      +/-   ##
==========================================
+ Coverage   93.94%   94.69%   +0.74%     
==========================================
  Files          28       24       -4     
  Lines        1338     1281      -57     
==========================================
- Hits         1257     1213      -44     
+ Misses         81       68      -13     

Flag	Coverage Δ
	94.69% <100.00%> (+0.74%)	⬆️

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