chore: remove pnpmfile to avoid renovate break

[Timeless0911]

Summary

https://github.com/renovatebot/renovate/discussions/30812 https://github.com/pnpm/pnpm/issues/7951

https://github.com/web-infra-dev/rspress/pull/1597 does not work.

Just remove .pnpmfile.cjs since we do not need it.

Related Issue

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

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