bug#40909: eww: Add max width option similar to Man-width-max

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Mon, 27 Apr 2020 20:24:26 +0200
> Cc: , larsi@gnus.org
> 
> Please consider implementing an option for eww that works like
> 'Man-width-max'.  I suggest a default value of 80, the same as
> Man-width-max.
> 
> Currently, we use eww by default when following links from
> 'display-about-screen', and it's very hard to read the rendered pages
> on high-resolution monitors.  So I think this would help the new user
> experience.

Isn't shr-width enough to do what you want?