CSS behaviors bug report: dark/light switch non-functional

["Robin H. Johnson" <robbat2@gentoo.org>]

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I wanted to include a patch, but no obvious way without it being messy
really stood out, so this is only a bug report.

contrib/css describes using the 'prefers-color-scheme' media query
selector, but Gentoo got a report that the selection between light &
dark didn't work.

One of the other devs traced it down to nuances of the HTML link media
attribute: query expressions are not valid in the HTML variant in some
browsers.

This is also mentioned here:
https://stackoverflow.com/questions/69113672/loading-css-based-on-prefers-color-scheme-media-query
> Loading CSS based on any media query expression seems to be out of specification for the media attribute.

As a workaround, I merged the two files with a wrapper, but it feels
sub-optimal, because the entire text gets injected into the PI HTML.

```
@media(prefers-color-scheme: dark) {
 ... #content of 216dark
}
@media(prefers-color-scheme: light) {
 ... #content of 216light
}
```

I think the cleanest solution would be a variant of the above:
clauses, but with @import statements inside them, and making PI-httpd
expose all the CSS Files.

-- 
Robin Hugh Johnson
Gentoo Linux: Dev, Infra Lead, Foundation President & Treasurer
E-Mail   : robbat2@gentoo.org
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