[whatwg/webidl] Broken CSS on webidl.spec.whatwg.org (#1034)

It seems some of the CSS for webidl.spec.whatwg.org is missing (now that it redirects - I guess this is a very new change). For example, styling for the "advisement" class is missing.

I'm seeing these console errors in Chrome, which sound related, but none of them seem to define that particular style.

```
The FetchEvent for "https://resources.whatwg.org/spec.css" resulted in a network error response: an "opaque" response was used for a request whose type is not no-cors
The FetchEvent for "https://resources.whatwg.org/standard-shared-with-dev.css" resulted in a network error response: an "opaque" response was used for a request whose type is not no-cors
The FetchEvent for "https://resources.whatwg.org/standard.css" resulted in a network error response: an "opaque" response was used for a request whose type is not no-cors
```

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