Add /go/flutter-file-system design doc redirect

[bparrishMines]

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[gemini-code-assist]

Summary of Changes

Hello @bparrishMines, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the firebase.json configuration to include a new permanent redirect. The change ensures that a previously unhandled or incorrect short URL now correctly directs users to its intended Google Docs resource, enhancing navigation and access to documentation.

Highlights

• New Redirect Rule: Added a 301 redirect for the /go/flutters-file-system short URL, pointing it to a specific Google Docs document.

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[gemini-code-assist]

Code Review

This pull request adds a new redirect to firebase.json. My review includes a suggestion to correct a likely typo in the new redirect's source path to align with standard URL conventions. Please also ensure the list of redirects remains alphabetically sorted after applying the change.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 44facb0):

https://flutter-docs-prod--pr12784-bparrishmines-flutters-file-vih9ynfd.web.app

[parlough]

Thanks!