www/nyxt: New port: Keyboard-driven web browser which uses WebKitGTK backend

Nyxt is a keyboard-driven web browser designed for hackers. Inspired by Emacs
and Vim, it has familiar keybindings (Emacs, vi, CUA), and is infinitely
extensible in Lisp.

WWW: https://nyxt.atlas.engineer/
Co-authored by: shamaz.mazum[at]gmail[dot]com
PR: 284258