Search in documentation does not do full-text search

[denkv]

Description

The provided search functionality does not really perform full-text search. Looks like it just uses this file which has no full texts: https://hobbit-project.github.io/search.json

Reproducability

Steps to reproduce the behavior:

1. go to https://hobbit-project.github.io/
2. put "HOBBIT_SESSION_ID" (for example) to the search field, press Enter
3. "No results found"

Expected behavior

Pages which contain the entered text appear in the search results, or the search field clearly says it just searches pages by title.