Adds sponsor section to readme file

[louislelay]

📝 Description

Adds a sponsor section and also changes a few title format to the readme

🛠 Type of Change

• Documentation update

✅ Checklist

• I’ve run pre-commit on all modified files
• I’ve tested in simulation or verified that changes don’t break expected behavior
• I’ve updated documentation where needed
• I’ve reviewed open issues to ensure this is not a duplicate
• Code follows the repository’s style and structure