[sway] theming improved; support matcha-green and matcha-blue working

overlays/sway/etc/profile.d/gtk-wayland.sh

overlays/sway/etc/skel/.config/gtk-4.0/settings.ini

overlays/sway/etc/sway/config.d/99-autostart-applications

overlays/sway/etc/sway/definitions

overlays/sway/etc/sway/themes/matcha-blue/gtk

overlays/sway/etc/sway/themes/matcha-blue/sway

overlays/sway/etc/sway/themes/matcha-green/gtk

overlays/sway/etc/sway/themes/matcha-green/sway

overlays/sway/usr/local/bin/import-gtk3-settings.sh