[Issue]: Air Gapped V9 Elastic Docs broken links

initially reported by @tiaanwest

### Before you submit

- [x] This issue is about a documentation page, flow, or piece of content.

### Type of issue

Other

### What documentation page or section is affected

https://localhost:8080/docs/reference

### What happened?

Customer has installed [Offline docs](https://support.elastic.co/knowledge/1369f209) in Air-Gapped environment.
The docs are up and running and accessible at their endpoint http://:3000/docs/reference
Some of the links in the documentation however show up as localhost:8080/docs/reference/  instead of http://:3000/docs/reference/

I get the same behaviour when testing locally. It shows a localhost:8080 link for something that should be localhost:3000 . See screenshot.