Add docs site

[natemoo-re]

In preparation for the release of #111, it's time that Astro Icon gets a proper docs site!

https://astroicon.dev will be powered by Starlight.

Content WIP!

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Latest commit: 8ecf1db

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Name	Status	Preview	Comments	Updated (UTC)
api-astroicon	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 22, 2023 7:52pm
astroicon	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 22, 2023 7:52pm