Remove findDOMNode in about-us page #1899
Description
Currently, when running make lint in this repo, it still suffers from react/no-find-dom-node warnings:
The reason we want to have no warning when using eslint --fix is we'd like to enable the linter on CI but the warnings will break it.
To be precise, we need to refactor away use of the deprecated API findDOMNode in about-us page.
Related thread: #1877