d2l-ai/d2l-en ? reverse-engineered prompt

I want to build an interactive online book to teach deep learning. The entire book should be built from Jupyter notebooks, allowing me to mix explanatory text, mathematical formulas, and diagrams with runnable code examples.

A key feature is that the code needs to support multiple frameworks. For each concept, I want to show the implementation in PyTorch, TensorFlow, and JAX so that users can learn using the tool they prefer. The content should be comprehensive, covering everything from the basics like linear regression and multilayer perceptrons up to more advanced topics like transformers, computer vision, natural language processing, and even recommender systems.

The final output should be a clean, modern website where each notebook becomes a webpage. The goal is to create a hands-on resource that helps people really learn by doing, not just reading.