Deploy the documentation using deploy-pages

[mwouts]

I have accidentally deleted the gh-pages branch. I will thus update the deploy workflow according to the jupyter book documentation

[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@deploy_pages

(this requires nodejs, see more at Developing ITables)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.27%. Comparing base (8385779) to head (e7c3ec1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #396   +/-   ##
=======================================
  Coverage   89.27%   89.27%           
=======================================
  Files          44       44           
  Lines        1836     1836           
=======================================
  Hits         1639     1639           
  Misses        197      197           

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