Add shortcuts to switch workspaces

dotfiles/i3/config

@@ -108,6 +108,8 @@ bindsym $mod+7 workspace $w7
 bindsym $mod+8 workspace $w8
 bindsym $mod+9 workspace $w9
 bindsym $mod+0 workspace $w0
+bindsym $mod+Page_Up   workspace prev_on_output
+bindsym $mod+Page_Down workspace next_on_output
 
 # move focused container to workspace
 bindsym $mod+Shift+1 move container to workspace $w1
@@ -120,6 +122,8 @@ bindsym $mod+Shift+7 move container to workspace $w7
 bindsym $mod+Shift+8 move container to workspace $w8
 bindsym $mod+Shift+9 move container to workspace $w9
 bindsym $mod+Shift+0 move container to workspace $w0
+bindsym $mod+Shift+Page_Up   move container to workspace prev_on_output
+bindsym $mod+Shift+Page_Down move container to workspace next_on_output
 
 bindsym $mod+Shift+grave move scratchpad
 bindsym $mod+grave scratchpad show