Update Netlify guide to include details on using remote images

[ascorbic]

Description (required)

https://github.com/withastro/adapters/pull/187 adds support to the Netlify adapter for image.domains and image.remotePatterns. This PR updates the docs with details of how to use them. It also fixes a couple of errors in the other code samples.

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Depends on https://github.com/withastro/adapters/pull/187

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Name	Status	Preview	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	Mar 20, 2024 10:47am

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[ascorbic]

Thanks, @sarah11918!