docs: use final animated banner in README

[robzolkos]

Summary

• replace the README banner with the cleaner final state from the animated Fizzy banner
• remove the background speckle/noise so the ASCII matches the polished end frame more closely
• keep the embedded "by 37signals" tagline

Testing

• not run (README-only change)

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Summary by cubic

Replace the README banner with the final static frame from the animated Fizzy banner for a cleaner, sharper ASCII.
Removes background speckle/noise and keeps the "by 37signals" tagline.

^{Written for commit cd83640. Summary will update on new commits.}

[Copilot]

Pull request overview

This PR replaces the noisy ASCII banner in the README with a cleaner final frame from the animated Fizzy banner, removing background speckle/texture while preserving the core design and "by 37signals" attribution.

Changes:

• Simplified ASCII art by removing decorative noise/speckle characters from the Fizzy logo banner
• Replaced textured background with clean spacing to create a more polished appearance
• Preserved the embedded "by 37signals" attribution in the final line of the banner

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[cubic-dev-ai]

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