docs: privatelink feature

[doublethink]

I have read the CONTRIBUTING.md file.

YES/NO

What kind of change does this PR introduce?

docs update

Additional context

Enterprise documentation for Privatelink feature (alpha)

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[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

rdjsonl

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🚫 [rdjsonl] _{reported by reviewdog 🐶}
[Rule003Spelling] Word not found in dictionary: PrivateLink (configure rule at supa-mdx-lint/Rule003Spelling.toml)

supabase/apps/docs/content/guides/platform/privatelink.mdx

Line 100 in 613f6f1

Ready to enhance your database security with PrivateLink? [Contact our Enterprise team](https://supabase.com/contact/enterprise) to discuss your requirements and begin the setup process.