Search returns "raw" schemas before other schemas

[evansd]

Searching for tables which appear in both "cooked" and "raw" schemas returns the raw schema first, which confuses users.

For example:

Thread where this confusion arose:
https://bennettoxford.slack.com/archives/C04DVD1UQC9/p1709896596557359

[StevenMaude]

The developers of Material for MkDocs are working on an improved search feature, which might help here.

As a shorter term solution, perhaps manually adjusting the search boost to derank one page relative to the other might be worth testing out.

[evansd]

Closing in favour of opensafely-core/ehrql#2086 (I'd have just transferred the issue but it's a different org so that's not possible).