feat: redesign homepage with triptych process + admin image management

- Redesign Hero section with new copy focused on the triptych offering
- Add Process component (replaces System) with zigzag layout for 3 pillars:
  Google Maps reviews, managed Facebook, converting website
- Redesign AboutMe with orange background and stats row
- Add admin panel for managing site image URLs (replaces Sanity dependency)
- Create site_images API routes and Supabase-backed storage with defaults
- Update FAQ to reference built-in admin panel
- Add site_images table type to database types
- Pass images prop through homepage components

https://claude.ai/code/session_01V8YAjpqRQ3bfBYsABYsEgo

components/marketing/DemosLive.tsx

@@ -49,7 +49,11 @@ const demos = [
   },
 ];
 
-export default function DemosLive() {
+interface DemosLiveProps {
+  images?: Record<string, string>;
+}
+
+export default function DemosLive(_props: DemosLiveProps) {
   return (
     <section id="demos" className="py-16 md:py-24 bg-bg" aria-label="Démos live">
       <div className="max-w-6xl mx-auto px-4 sm:px-6 lg:px-8">