docs: use package-install tabs on getting started

[SutuSebastian]

Summary

• Switch the Getting started Install fence from a bun-only bash block to Blume package-install (npm/pnpm/yarn/bun tabs), matching Install and the adapters.
• Label docs so merge triggers Deploy docs FTP without waiting for a package release.

Test plan

• Preview /guides/getting-started#install — package manager tabs render
• Confirm copy commands resolve to @stainless-code/react-layers
• After merge, confirm Deploy docs workflow runs (docs label)

[changeset-bot]

⚠️ No Changeset found

Latest commit: 18d73b3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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Configuration used: defaults

Review profile: CHILL

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Run ID: aecc1c31-dbe7-4767-b59f-af75c477655b

📥 Commits

Reviewing files that changed from the base of the PR and between 395d860 and 18d73b3.

📒 Files selected for processing (1)

• apps/docs/content/guides/getting-started.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/getting-started-package-install

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