mathjax/MathJax: MathJax v4.1.1

This is mainly a bug fix release that resolves a number of issues from v4.1.0. The key fixes include: Fixed CS for positioning dialogs so that they appear at the proper location in a scrolled window, and so that page doesn't scroll to the top. A new ui/no-dark-mode extension has been added to disable MathJax's dark-mode color scheme for those pages that don't implement a dark-mode color set. Handling of clicks in form elements embedded within an expression are now better handled by the expression explorer, and tabbing will include embedded form elements. The expression explorer now passes mouse clicks and other events on to the surrounding parent tags, so that math within a <button> element, for example, will allow the button to receive the click event when you click on the math. A number of speech improvements have been made, including better handling of phantom elements, better speech for over/under constructions, and better handling of the speech for tables. Speech is now properly added to inline elements in SVG output when automatic in-line line-breaks are allowed. See the v4.1.1 release notes for additional details.