Why on earth is it helpful for the "above the fold" content on the WPSE help page to be generic information about SE network sites in general? All of that Take the Tour and Here's how it works banner content should be moved to the About page.
I assume this also breaks our "magic links" to the FAQ and FAQ sections? So we need some new magic links.
Twenty Seventeen is considered to be part of WordPress core.
While the theme itself has been developed on GitHub, the proper channel for reporting issues in it is same as WordPress core — https://core.trac.wordpress.org/