Add link to new stateless information page

[Sophia-Gold]

Add link to new Stateless Information Page (stateless.fyi) in roadmap section.

Description

This is for onchain days. It's not important.

Related Issue

#14887

[netlify]

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Lighthouse	7 paths audited Performance: 47 (🔴 down 7 from production) Accessibility: 95 (🟢 up 3 from production) Best Practices: 89 (🔴 down 9 from production) SEO: 98 (no change from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

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[github-actions]

This issue is stale because it has been open 30 days with no activity.

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