Docs: Improve our documentation following the Astro integration

[louismaximepiton]

Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Following #603, here are some ideas to improve the documentation:

• Create a real landing page versionless
• Create a real landing page for each version
• Create a branch gh-pages probably to have all our minor versions stored somewhere (Add a script to ease the documentation release process)
• Create a version picker to navigate between versions
• Create aliases for pages so we can always access to the last version of the page
• Provide some components to mutualize code (Cards for Examples or Use cases pages, Examples for the iframes we have, ...)
• Use built-in Prism component (https://docs.astro.build/fr/guides/syntax-highlighting/#prism- and https://github.com/Orange-OpenSource/Orange-Boosted-Bootstrap/blob/main/site/src/components/shortcodes/Code.astro)
• Create a file to have global variables such as the docs version, etc...

Motivation and context

Better our documentation.