feat: make mobile app a first-class landing path

[SmartMenu9872]

Summary

• Reframes the hero around Gibwork's current outcome-based marketplace with distinct contributor and team calls to action.
• Adds a two-path product journey that explains discovery, proof of work, review, approval, and payout.
• Makes the mobile apps a first-class conversion path with official App Store and Google Play links plus a responsive product preview built in code.
• Replaces stale opportunity examples, refreshes FAQ and metadata copy, and improves navigation and social-link accessibility.

Why

The existing landing page presents Gibwork as a generic freelance marketplace and does not explain the complete task-to-payout flow or surface the iOS and Android apps. This update gives each audience a clear next step while keeping the design system and existing product architecture intact.

Screenshots

Updated hero

Contributor and team journeys

Mobile app section

Verification

• corepack yarn build
• git diff --check
• Visual review of the hero, workflow, mobile app, navigation, and anchor behavior in the local Next.js app

Submitted for the Gibwork landing-page enhancement task.

[vercel]

@krysto9872 is attempting to deploy a commit to the gibwork Team on Vercel.

A member of the Team first needs to authorize it.