docs: remove deprecated 'Setup with Create React App' guide (#15882)

[harielfr]

Summary

This PR addresses the outdated guidance regarding the setup of Jest with React projects.

The Create React App (CRA) is no longer actively maintained and is considered deprecated. This change removes the dedicated "Setup with Create React App" section from website/docs/tutorial-react.md and replaces it with a cautionary note directing users to modern alternatives like Vite or Next.js.

It also renames the "Setup without Create React App" section to "Manual Setup" to promote it as the default configuration guide.

Test plan

Since this change is purely documentation (Markdown) and does not involve changing any source code, no new tests were added.

I confirmed that:

The relevant section was removed from website/docs/tutorial-react.md.

The resulting Markdown file renders correctly, showing the new caution block regarding CRA's deprecation.

The dependencies were installed successfully using npm exec yarn install.

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• ✅ login: cpojer / name: Christoph Nakazawa (bb57905)
• ❌ - login: @harielfr / name: Enzo Hariel Ferreira Gaspar . The commit (09f5af3) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

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