Add keys to navigate between outputs

dotfiles/i3/config

@@ -44,6 +44,18 @@ bindsym $mod+Down           focus down
 bindsym $mod+Up             focus up
 bindsym $mod+Right          focus right
 
+# change output focus
+bindsym $mod+Ctrl+h         focus output left
+bindsym $mod+Ctrl+j         focus output down
+bindsym $mod+Ctrl+k         focus output up
+bindsym $mod+Ctrl+l         focus output right
+
+# alternatively, you can use the cursor keys:
+bindsym $mod+Ctrl+Left      focus output left
+bindsym $mod+Ctrl+Down      focus output down
+bindsym $mod+Ctrl+Up        focus output up
+bindsym $mod+Ctrl+Right     focus output right
+
 # move focused window
 bindsym $mod+Shift+h        move left
 bindsym $mod+Shift+j        move down