docs: add css rule for firefox font varient ligatures - issue #2138

[Lowza]

Why

resolves #2138

What

Added a CSS rule for Firefox only:
font-variant-ligatures: none;

Checklist

• Ready to be merged

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Latest commit: dce64d7

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Name	Status	Preview	Comments	Updated (UTC)
react-spring	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 14, 2023 1:32pm

[joshuaellis]

Thanks for the fix!