The content platform this site lives on is called Gitbook. It's a rather lovely way to create a simple knowledge site with basic organization features and search. However, using Gitbook as of March of 2019 has one problem: they track you even when I don't.
I have opted out from all tracking I can because I don't want to contribute to the Google/Facebook problem. But despite me setting everything off, Gitbook still injects their Google Analytics and Mixpanel tracking codes.
The page also uses Google Fonts, and I can't change that either. From leaking-your-visitors-data-to-Google perspective, using Google Fonts is the same as using Google Analytics.
I've suggested to Gitbook to give me a choice to opt-out from all tracking scripts, including theirs, but my suggestion hasn't been implemented yet. You can follow the progress of implementation at https://gitbook.canny.io/feature-requests/p/allow-to-opt-out-from-all-tracking.