Doc search only returns API reference matches

The search function of the docs is only showing matches in the API reference, and all the rest of the docs are ignored.

**To Reproduce**
Steps to reproduce the behavior:
1. Open docs, and search for anything present in the non API reference, eg. "Getting started"
2. Zero results

For example: [try this search](https://compas-dev.github.io/main/search.html?q=Getting+started&check_keywords=yes&area=default#)

**Expected behavior**
At least one match should be found.

**Additional context**
This does not happen with readthedocs search, so I am assuming it's not a sphinx issue but something we do in the preprocessing of search results. Considering the number of issues with had this preprocessing, should we just drop it?