Documentation UI polluted with floating artifacts

**Problem**
The documentation pages are polluted with unnecessary floating artifacts.

**Steps to Reproduce**
Access the [documentation page](https://blizzard.github.io/node-rdkafka/current/index.html).

**Additional context**


Open the documentation page linked in the issue and compare its rendered floating artifacts with the attached screenshot. Identify the documentation source or build entry point responsible before making changes. Done means the unnecessary artifacts no longer appear on the documentation pages and the result can be verified in the rendered page.

Written by the indexing model from the issue text.