Look into src/index.jsx to take a look at how we set up routing & SSR. You can then run the build script to prerender the app.
This is built on @preact/preset-vite's prerendering functionality simply because it was quick for me to set up -- all it does is call the exported prerender function, passing in data like the current URL, and expects HTML back. Just a very quick example for how you might set up a real app using these techniques but you absolutely can rip it out and use it in any way you'd like.