feat(story): build procedural notebook animation

CREDITS.md

@@ -1,15 +1,5 @@
 # Credits / Third-party assets
 
-## 3D model — “Laptop”
-- Author: **Kenney** (https://kenney.nl)
-- Source: https://poly.pizza/m/GnbwSUiVty
-- License: **CC0 1.0 Universal (Public Domain)** (https://creativecommons.org/publicdomain/zero/1.0/)
-- Used in: `app/components/story/NotebookStage3D.tsx`,
-  file at `public/models/laptop-kenney.glb`.
-- Modifications: the downloaded open-laptop geometry was split into
-  `Laptop_Base` and `Laptop_Lid` nodes around the hinge for scroll-driven
-  animation. CC0 does not require attribution; credit given anyway.
-
 ## Project screenshots
 - `public/assets/prints/*.png` are captures taken with headless Chrome from
   production deployments owned by the site author (evandro.dev.br), used as