feat: rebuild landing experience, content and analytics

CREDITS.md

@@ -4,3 +4,8 @@
 - `public/assets/prints/*.png` are captures taken with headless Chrome from
   production deployments owned by the site author (evandro.dev.br), used as
   on-screen content inside the notebook browser surface.
+
+## WhatsApp icon
+- The WhatsApp silhouette in `app/components/Contact.tsx` comes from
+  [Simple Icons](https://github.com/simple-icons/simple-icons/blob/develop/icons/whatsapp.svg).
+  It identifies the contact channel; it does not imply endorsement by WhatsApp.