Sketch landing page in Astro that matches the figma

Sketch landing page in Astro that matches the figma. The escrow accepts the merge cert only when the gitlawb oracle quorum signs a certificate proving that a PR resolving #1 landed on main.

• Tests must stay green on the target branch after merge.
• No new direct dependencies without justification in the PR body.
• If race-eligible, the first valid merge wins; honest losers refunded gas.