Meta tag tweaks, CSS small tweak.
CSS adjustments for screen sizes, and response to swiping, thanks to @williamsgarethrichard for their work on this.
Examples of auto numbering demonstrated and documented, small tweak to navigation button style
CSS for navigation buttons updated so that on-mouse-hover works as expected.
SHIFT+P shows all slides at once, and when printing to pdf, one slide per page is given in the pdf.
Initial release for a11y-slides-math.html.