Docs: clean up Astro component scripts

[DefinitelyMaybe]

This PR brings our Astro component scripts inline with how astro does them.

copied patterns were repeated. Anyone know where the { } pattern came from?

---
{
    'category': '@threlte/extras'
    'name': '<Align>'
}
---

vs

---
category: '@threlte/extras'
name: '<Align>'
---

This PR will also make a move to astro+starlight easier. I ran into a wall of errors because of it when trying to make it happen myself.

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Latest commit: c4272a0ed97f55adfe910e31346f168e874304a5

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Name	Status	Preview	Comments	Updated (UTC)
threlte	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 17, 2024 8:53pm

[michealparks]

Should we try doing this in the next branch? Might be easier to get it pushed through there

[DefinitelyMaybe]

Hmm just noticed the new conflicts. I'll do one a merge main commit next week. Hopefully some approval comes, I still have hope 😅