docs: add package resolution instructions for v4.0 opt-in

[antfu]

Summary

• Added comprehensive "Opting in to v4.0" section with package manager-specific instructions (npm, yarn, pnpm) for overriding the bundled DevTools with the v4 alpha version
• Updated the "Nightly Release Channel" section to use the same resolution-based approach for consistency across all package managers

This clarifies how users can opt into the v4 alpha by using package manager resolutions/overrides instead of modifying devDependencies directly.

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Latest commit:	2b736a3
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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 70618b4a-5ee1-48ac-b556-07ef7ced0ea0

📥 Commits

Reviewing files that changed from the base of the PR and between 2b157fb and 2b736a3.

📒 Files selected for processing (2)

• README.md
• docs/content/1.guide/0.getting-started.md

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📝 Walkthrough

Walkthrough

This pull request updates documentation files to provide guidance on accessing pre-release versions of Nuxt DevTools. A new "Opting in to v4.0" section is added to both README.md and the getting started guide, explaining how to override the bundled DevTools version via package manager resolutions. Configuration examples are provided for npm, yarn, and pnpm, including instructions to remove lockfiles and reinstall dependencies. The "Nightly Release Channel" section is also updated with similar resolution-based configuration examples, replacing previous guidance with explicit package manager override instructions.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch antfu/docs-v4-opt-in-resolution

📝 Coding Plan

• Generate coding plan for human review comments

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