On the editing help page there is a MathJax-dedicated section, which includes a "Learn more" link. We've recently been reminded that this link, whose default and current target is https://legacy-www.math.harvard.edu/texman/, can be customised:
What page should we link to in this help section?
We will regard upvotes/downvotes to an answer as consensus/disagreement with the associated proposal. Once we reach a consensus on an answer, we'll flag it to the CMs to have them enact the change.