Support URLs to static module assets

Such as:

```
https://wzrd.in/standalone/normalize.css@latest/normalize.css
```

Some modules come with styles, images, fonts, or other assets. Some modules such as normalize.css are only CSS (and break wzrd.in btw).

This would allow us to consume all of them.

No files or tests are named in the issue. Start by tracing the request path for the example wzrd.in URL and compare it with a normal module URL; done means static CSS, images, fonts, and other module assets can be fetched without breaking CSS-only modules such as normalize.css.

Written by the indexing model from the issue text.