pytorch/tutorials ? reverse-engineered prompt

Build me a clean documentation site for PyTorch tutorials that looks like the current PyTorch tutorials page and is easy to browse by topic and difficulty.

I want the tutorials organized into beginner, intermediate, advanced, recipes, and unstable sections, with a main landing page, cards for each tutorial, and working links to the individual tutorial pages. Please make it so tutorials can be written as simple Python files or notebook style examples and then show up as documentation pages automatically. If it helps, you can use the current docs and tutorial structure as a guide and look up any up to date Sphinx gallery docs online.

It should be possible to build the site locally, preview it without running all the expensive examples, and generate a single tutorial page when needed. Also make sure the repo includes the usual contribution and submission guidance, plus basic checks like spelling and docs build support.