docs: add links to other language versions of README

[dowithless]

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

why

what changed

test plan

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 09e33c479a38532a5ab8415b5d76cb01fa02206b

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.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[dowithless]

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