Highlight "perfect match" in search

[killercup]

I was just looking at https://crates.io/search?q=mail&sort=downloads and wondered why the "mail" crate with 33 downloads is on top of the list I specifically sorted by download count. Long code dive short, it's because it's a "perfect match" for my query and gets special treatment.

That's fine and all, but I think these entries should be highlighted a bit to justify their position. Especially when, as in the "mail" case, the perfect match is a placeholder crate.

[carols10cents]

This is a duplicate of #493. Thanks!