add initial base docs for font loading using theme.json

[fabiankaegy]

Description of the Change

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Changelog Entry

Added - New feature Changed - Existing functionality Deprecated - Soon-to-be removed feature Removed - Feature Fixed - Bug fix Security - Vulnerability

Credits

Props @username, @username2, ...

Checklist:

• [ ] I agree to follow this project's Code of Conduct.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my change.
• [ ] All new and existing tests pass.

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Name	Status	Preview	Updated
10up-gutenberg-best-practices	✅ Ready (Inspect)	Visit Preview	Jan 13, 2023 at 7:28AM (UTC)