Web documentation search bar doesn't respect selected package version

[zthart]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

5.x.x, 6.x.x

Node.js version

n/a

MongoDB server version

n/a

Typescript version (if applicable)

n/a

Description

The docs for versions 5.x.x and 6.x.x hosted at mongoosejs.com share the same layout and include a searchbar in the top left. When you're browsing docs for 5.x.x versions of mongoose, the search bar is unaware of the version, and will redirect you from a /docs/5.x/docs url to /docs/search.html?, which serves the "latest" docs. Effectively, the search function does not exist for the 5.x package, but the interface makes it appear as though they can be searched. This does not affect earlier package versions using a different doc site layout without a search bar.

Steps to Reproduce

1. Navigate to https://mongoosejs.com/docs/5.x/
2. Select "read the docs"
3. Type any query into the search bar, hit enter

Expected Behavior

Searching on the 5.x documentation returns search results for pages within the 5.x documentation, rather than the latest docs.