feat(home): rebuild .com landing page as AI marketing platform #4666

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/Dominat8.com/pull/36

Convert the pasted hero/3-step/stats HTML mock into a React/Next.js page that fits the existing d8 design system (Space Grotesk + d8-green, neon-cta and grid-bg utilities) instead of the cyberpunk Orbitron/neon-orange palette.

• Replace aggressive copy ("Don't Compete. DOMINAT8.", "crush your competition", "Launch Global Domination") with professional copy per CLAUDE.md.
• Drop the "coming soon" upload alert; replace with a real CTA card linking to https://dominat8.io/builder.
• Keep pricing block aligned with the CLAUDE.md source-of-truth table (Free / Starter $9 / Pro $29 / Agency $99 + $0.49 overage).
• Update root and (marketing) layout metadata to drop the "Dominate or Be Dominated" wording.