docs: update react day picker links

[denkristoffer]

Purpose of PR

React Day Picker changed its website to https://daypicker.dev/ – this PR updates our doc links.

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Latest commit: a67ca6b6124c4190cc87c2a579f80cca7f53e499

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[github-actions[bot]]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	135.79 KB (0%)	2.8 s (0%)	97 ms (-3.33% 🔽)	2.9 s
Module	132.05 KB (0%)	2.7 s (0%)	107 ms (+23.39% 🔺)	2.8 s