Add ReadyCloud to customer social proof band

[vpetersson]

Summary

• Adds ReadyCloud to the homepage social proof band introduced in Add customer social proof band to homepage #16
• Official wordmark from readycloud.com, unmodified (PNG is the only full-wordmark format they publish; 645px source is sharp at the 28px display height)
• Same grayscale-to-color hover treatment and explicit dimensions as the other customer logos

Testing

• bun run lint and bun run format:check pass

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