fix(docs): Kailua description

[clabby]

Overview

Fixes the description of kailua on the docs' front-page.

[Copilot]

Pull Request Overview

This PR fixes the description of the Kailua project on the documentation front page by updating it to accurately describe its purpose as a zkVM-based proof system using Kona, rather than an alternative OP Stack node.

• Updated Kailua's description to match its actual functionality
• Also clarified OP Succinct's description by removing "fault" from "fault proof system"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.7%. Comparing base (66a46a1) to head (9dafedc).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

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