New port: x11-themes/canta-gtk-themes: Canta is a flat Material Design theme for GTK 3, GTK 2 and Gnome-Shell

Canta is a flat Material Design theme for GTK 3, GTK 2 and Gnome-Shell which
supports GTK 3 and GTK 2 based desktop environments like Gnome, Unity, Budgie,
Pantheon, XFCE, Mate, etc.

WWW: https://github.com/vinceliuice/Canta-theme

PR: 248115

Submitted by: Alexander Vereeken <Alexander88207@protonmail.com>
Differential Revision: https://reviews.freebsd.org/D25733