[docs] "What's new in Svelte" January newsletter

[DreaminDani]

Let me know if there's anything I missed!

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Name	Status	Preview	Comments	Updated
hn	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Dec 30, 2022 at 2:09AM (UTC)
svelte-dev	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Dec 30, 2022 at 2:09AM (UTC)

[DreaminDani]

Looking much better thanks to @benmccann 's suggestions. Feel free to merge on Dec 31/Jan 1 unless there's any other edits folks would like to make before then :)

[DreaminDani]

@benmccann can we merge this, when you get a chance? Cc @dummdidumm

Happy new year!