bug#51137: 29.0.50; Make documentation more readable in mobile devices

[Stefan Kangas]

Glenn Morris <rgm@gnu.org> writes:

> Emacs developers have full control over the styling applied to the
> manuals on gnu.org. See
>
> https://web.cvs.savannah.gnu.org/viewvc/emacs/emacs/manual.css
>
> (It's true that this mostly just applies gnu.org style, but you could
> always stop doing so.)

But it seems better that the GNU stylesheet is updated, so that this is
fixed for everyone and not just for Emacs.

> and the tweaks from  manual-html-fix-* in admin/admin.el .