[llvm] [llvm-cov] Add HTML dark theme support (PR #93080)

[via llvm-commits]

EdJoPaTo wrote:

> Personally I liked the previous color palette better as it was pastel colors, now it's a bit more saturated for me (in light mode).

That's from improving the color contrasts:

> I also improved some color contrasts (Firefox accessibility tool reported them) and ensured that line-number links keep their text-decoration.

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> Interesting the line 65 with `url.clone()` is now block and before it was yellow only to end of line. Can't find the corresponded change in diff.

It's now at line 234: `tr:has(> td >a:target)`

https://github.com/llvm/llvm-project/pull/93080