Update README

README.md

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-A NES emulator written in Rust.
+A NES emulator written in Rust, go to [nes.ael.red](https://nes.ael.red) to see it in action!
 
+# Quickstart
+
+To run locally, [install Just](https://just.systems/man/en/packages.html), get a NES ROM file and run:
+
+```bash
+just run <path to .nes ROM file>
 ```
-$ cargo install --path .
-$ nes-rust myrom.nes
+
+If you need a NES ROM, try the [Alwa's Awakening demo](https://eldenpixels.itch.io/alwas-awakening-the-8-bit-edition#:~:text=944%20kB-,Download%20demo,-Download).
+
+To run the web version, run:
+
+```bash
+just serve
 ```
+
+And navigate to [http://localhost:8080](http://localhost:8080).
+
+# Runtimes
+
+The emulator supports two "runtimes": [SDL](#sdl) and [web](#web).
+
+- SDL: Runs locally on your computer using SDL 2.
+- Web: Runs in the browser using WASM, configured in [./web](./web).
+
+# Deployment
+
+The emulator is deployed to the web with GitHub pages in [deploy.yml](./.github/workflows/deploy.yml), using infrastructure provisioned with terraform in [./deploy/infrastructure](./deploy/infrastructure). It's available at [nes.ael.red](https://nes.ael.red).