feat(fonts): local inference

[florian-lefebvre]

Description (required)

• Clarifies what unicodeRange does (feedback from Matt)
• Explains how to infer weight and style for the local provider. I'm not really happy about what I wrote because it's at the end of the section but it's important because it's teh default feedback welcome!

Related issues & labels (optional)

• Closes #
• Suggested label:

For Astro version: 5.7.x. See withastro/astro#13640

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[sarah11918]

Approving based on @ArmandPhilippot 's suggestion! Thank you both for making these docs more explicit, and therefore more helpful!