Set up dunst and sway for dual head

- Configure sway to place displays matching reality
- Reconfigure sway mpv shortcut to use regular clipboard, not primary
- Drop the hard placement of dunst's output so it uses display 0

.config/dunst/dunstrc

@@ -8,7 +8,6 @@
     horizontal_padding = 1
     notification_limit = 20
     shrink = no
-    monitor = 1
     follow = none
     indicate_hidden = yes
     transparency = 0