chore: defer people to docs for getting started

[james-elicx]

I don't think it makes sense to maintain two separate guides, especially when they both have a lot of overlap. We should just maintain the guide for starting/migrating apps in the docs and defer users to that page.

[changeset-bot]

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Latest commit: 02ee298

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[pkg-pr-new]

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pnpm add https://pkg.pr.new/@opennextjs/cloudflare@73

commit: 02ee298

[dario-piotrowicz]

I'd be happy to proceed with this PR's changes

@vicb please let me know what you think, if you strongly disagree we can think of something else and decline the PR, I'd just avoid to keep this lingering indefinitely