Search links are agnostic of target

[lhstrh]

When search finds certain keywords, they might originate from a target-specific page. When you click on it, the target selector does not switch to the appropriate target, meaning the user is shown a page that does not have the content that was searched for.

To reproduce, select the C target and then search for private preamble (a feature that the C target not yet has). After clicking on the first hit, you navigate to the page about preambles, but the the target is still C, not C++.

[lhstrh]

@axmmisaka, once we have Algolia indexing working for the new website, let's revisit this.