New port: www/browsh: Text-based browser supporting HTML5, CSS3, JS, video and WebGL

Browsh is a fully-modern text-based browser. It renders anything that a
modern browser can; HTML5, CSS3, JS, video and even WebGL. Its main purpose
is to be run on a remote server and accessed via SSH/Mosh or the in-browser
HTML service in order to significantly reduce bandwidth and thus both
increase browsing speeds and decrease bandwidth costs.

WWW: https://www.brow.sh/

Differential Revision: https://reviews.freebsd.org/D22853