Fix Storage Buckets icon

[mishig25]

Summary

• Replace the incorrect folder icon for Storage Buckets on the hub docs index page with the correct storage bucket icon (layered squares SVG)

follow up to #2274

before

after

Test plan

• Verify the new icon renders correctly on the hub docs index page

Made with Cursor

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Note

Low Risk
Documentation-only change that swaps an inline SVG icon; risk is limited to potential visual/rendering regressions on the docs hub page.

Overview
Updates docs/hub/index.md to replace the inline SVG used for the Storage Buckets card (previously a folder icon) with a new layered-squares storage bucket icon, adjusting the SVG attributes accordingly.

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[HuggingFaceDocBuilderDev]

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