Make i3 monitor config handled by dotter

This will make it possible to merge all branches and only use master,
then let dotter handle different devices

.dotter/global.toml

@@ -24,6 +24,10 @@ mc = "~/.config/mc"
 "i3/i3-scrot.conf" = "~/.config/i3-scrot.conf"
 "i3/i3status-rust" = "~/.config/i3status-rust"
 
+[i3.variables]
+monitor-primary = "not-specified"
+monitor-secondary = "not-specified"
+
 [emacs.files]
 "emacs/doom" = "~/.config/doom"
 # "emacs/spacemacs/.spacemacs" = "~/.spacemacs"