[📝 Documentation] Improve doc with new theme

[bruhnild]

Description

Related Issue

Checklist

• [ ] I have followed the guidelines in our Contributing document
• [ ] My code respects the Definition of done available in the Development section of the documentation
• [ ] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] New and existing unit tests pass locally with my changes
• [ ] I added an entry in the changelog file
• [ ] My commits are all using prefix convention (emoji + tag name) and references associated issues
• [ ] I added a label to the PR corresponding to the perimeter of my contribution
• [ ] The title of my PR mentionned the issue associated

[babastienne]

duplicate of #3937 ?