Add PackageManagerTabs to guides/deploy/vercel.mdx

[trueberryless]

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Add pnpm and yarn commands via PackageManagerTabs component.

!!! IMPORTANT !!!

I'm working from mobile, so commands are not tested, not sure if pnpm and yarn add is correct. Pls review!

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[sarah11918]

Just a heads up that in future, if this isn't a super urgent fix, then it would be more helpful if you waited to PR until you knew what you were adding were correct! 😅

It's less helpful to put something on a maintainer's plate when you haven't yet taken the time to ensure accuracy, and I'm not sure why this PR was made at this stage when it clearly could have waited until you were able to verify the contents.

Have you had a chance to verify the content?

[trueberryless]

Just a heads up that in future, if this isn't a super urgent fix, then it would be more helpful if you waited to PR until you knew what you were adding were correct! 😅

Yeah, I'm really sorry about. I'm just too enthusiastic about Astro, so I work from mobile... Gonna stop such things in the future!

Have you had a chance to verify the content?

I guess I could have asked Mr Google what the pnpm and yarn equivalents are...

[TheOtterlord]

lgtm. one small change to sync the commands with our vercel integration guide.