make just variable to make it easier to make more scripts like this

i3/.config/i3/config

@@ -7,6 +7,7 @@ set $down j
 set $up k
 set $right l
 set $term alacritty
+set $just just --justfile ~/.config/i3/justfile 
 
 # Window borders
 new_window 1pixel
@@ -21,7 +22,7 @@ exec --no-startup-id feh --bg-max ~/.wallpaper/
 bindsym $mod+Return exec $term
 bindsym $mod+q kill
 bindsym $mod+d exec --no-startup-id dmenu_run
-bindsym $mod+m exec --no-startup-id just --justfile ~/.config/i3/justfile choose-monitor
+bindsym $mod+m exec --no-startup-id $just choose-monitor
 
 # Floating modifier
 floating_modifier $mod