Update deployment documentation for Vercel.

[leerob]

This PR updates the deployment documentation for Vercel to be more concise. I've also fixed the astro.vercel.app URL to be updated 😄

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Latest commit: ce828ee

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[netlify]

✔️ Deploy Preview for astro-docs-2 ready!

🔨 Explore the source changes: 076a4b9

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[netlify]

✔️ Deploy Preview for astro-docs-2 ready!

🔨 Explore the source changes: ce828ee

🔍 Inspect the deploy log: https://app.netlify.com/sites/astro-docs-2/deploys/61f7090af5e27c0007caf626

😎 Browse the preview: https://deploy-preview-2500--astro-docs-2.netlify.app

[natemoo-re]

Thanks @leerob, this looks great!