Adds Hookdeck website and docs as an example production site

[leggetter]

Description (required)

I believe hookdeck.com and hookdeck.com/docs are good production examples of what's possible with Astro.

I'm leggetter in the Astro Discord.

Website

Docs

[vercel]

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Mar 27, 2024 11:47am

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[sarah11918]

Thank you for adding a new resource, @leggetter ! We admittedly don't have a large sample of Markdoc examples, so it's always interesting to see one!