fastai/fastbook ? reverse-engineered prompt

Build me a clean notebook based learning site for a deep learning book, with chapters that open in Jupyter or Colab and cover the basics of fastai and PyTorch from start to finish. I want the repo organized so each chapter is a separate notebook, with a few supporting files for shared utilities, images, and translations, and a simple landing page that helps people find the chapters quickly. Please make it feel like a real educational project, not a toy demo, with clear examples, code cells that actually run, and a setup that works for people reading online or opening things locally. If you need to, look up the current docs for any library details before wiring things together. Keep the writing and structure beginner friendly, since this is meant to teach deep learning step by step.