Minimal scraper working from end-to-end

[benoit74]

Fix #2

This is the first PR putting mostly everything in place for this scraper:

• Python code
  • minimal structure, with very small client allowing to fetch icon + description from a Libretexts library home page
• Vue.JS code
  • minimal structure, with support for old browsers, based on Youtube ZIM UI
• Github workflows
  • based on python-bootstrap with addition for Vue.JS
• Documentation

End-to-end test:

docker build -t local-libretexts2zim .
docker run --rm -it -v "$PWD/output":/output local-libretexts2zim libretexts2zim --library-slug geo --library-name Geosciences --file-name-format "tests_en_libretexts-geo"

This will create a tests_en_libretexts-geo.zim file in output subfolder, ready to use in kiwix-serve or any other reader.

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