Remove demo link from verify-onchain guide

[youssefea]

Summary

• Removes the "Try the demo" link (base-verify-onchain-demo.vercel.app) and its mention from the Base Verify Onchain guide
• Keeps the "Live on Base Sepolia" tip and the interest-form CTA intact
• Confirmed no other references to this demo link exist elsewhere in the docs repo

Test plan

• Ran /lint on the changed file — no errors or warnings
• Verified diff is minimal and scoped to the demo link removal

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

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[cb-heimdall]

Review Error for kushagras481 @ 2026-07-30 19:27:49 UTC
User failed mfa authentication, either user does not exist or public email is not set on your github profile. \ see go/mfa-help

[cb-heimdall]

Review Error for patnir @ 2026-07-30 19:28:48 UTC
User failed mfa authentication, see go/mfa-help

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Project	Status	Preview	Updated (UTC)
base	🟡 Building	–	Jul 30, 2026, 7:15 PM

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