site: remove unused font files

[benmccann]

As far as I can tell, these aren't being used and are just duplicates of https://github.com/sveltejs/site-kit/tree/master/packages/site-kit/src/lib/styles/fonts

[changeset-bot]

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Latest commit: abf3370

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[PuruVJ]

Aha good catch!