Update Gumroad example card to public product route

[justin808]

Summary

• Repoint the Gumroad example card to the public product-page RSC demo route.
• Reword the card away from the old auth-gated creator dashboard comparison.
• Aligns the examples page with Add public product RSC demo routes react-on-rails-demo-gumroad-rsc#25 and reactonrails.com#121.

Validation

• npm --prefix prototypes/docusaurus run typecheck
• npm run prepare
• npm --prefix prototypes/docusaurus run build

Build completed successfully. It still emits existing docs broken-link/anchor warnings unrelated to this card change.

Merge note

Keep this draft until https://gumroad.reactonrails.com/public_product/rsc_demo returns 200 on staging. As of opening this PR, the route still returns 404 because the Gumroad staging deploy has not completed.

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Note

Low Risk
Marketing copy and a single demo URL in the Docusaurus examples constants; no runtime or security impact.

Overview
Updates the Gumroad flagship demo card in demos.ts so the live link and copy match the public RSC product-page benchmark instead of the old creator-dashboard framing.

The demoUrl now points to https://gumroad.reactonrails.com/public_product/rsc_demo (replacing the site root). The tagline is reworded to describe a public product-page benchmark comparing Inertia and React on Rails Pro with React 19 and RSC.

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Cloudflare preview deployed.

• Branch: pr-124
• URL: https://dd15ea9c.reactonrails-com.pages.dev