doc: Add links to translated README versions

[dowithless]

Added language selection links to the README for easier access to translated versions: German, Spanish, French, Japanese, Korean, Portuguese, Russian, and Chinese.

The updated links can be previewed in my forked repository: https://github.com/dowithless/stagehand/tree/patch-3

why

what changed

test plan

[greptile-apps]

Greptile Summary

This PR adds internationalization support to the README by including language selection links for 8 different translations. The change introduces a centered paragraph with links to German, Spanish, French, Japanese, Korean, Portuguese, Russian, and Chinese versions of the documentation via the readme-i18n.com service.

The implementation adds an HTML paragraph element positioned strategically after the project branding but before the main content, making language options easily discoverable for international users. The links follow a consistent pattern using the readme-i18n.com service with language codes in the URL path. An inline comment indicates this is part of an automated translation system that will keep translated versions synchronized with the main README as it evolves.

This change integrates well with the existing documentation structure and aligns with best practices for international accessibility in open-source projects. The positioning and formatting are consistent with the existing README styling.

PR Description Notes:

• The PR template sections (why, what changed, test plan) are present but left empty

Confidence score: 5/5

• This is an extremely safe documentation-only change that poses no risk to production code
• The change is purely cosmetic HTML additions to a README file with no functional code modifications
• No files need additional attention - this is a straightforward documentation enhancement

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[dowithless]

For Chinese users, we’ve also added a Chinese version of the docs! Check it out here: https://stagehand.readme-i18n.com/zh