- Add icon.png as default favicon (cropped to remove transparent padding)
- Fix layout.tsx to use icon.png as fallback when favicon_url is not set in DB
- Move ADMIN_GUIDE.md to docs/ folder
- Add docs/CUSTOMIZATION.md with guide on how to customize icon, title, footer
Covers all admin sections with step-by-step instructions:
login, dashboard, products (detailed field reference including image
upload with aspect ratio guidance), product types, categories,
orders, customers, reviews, admin users, settings, and recommended
onboarding flow.
davide