update dotfiles

sway/config.d/default

@@ -218,11 +218,12 @@ bindsym $mod+r mode "resize"
     bindsym $mod+o exec firefox
 
 #
-# Suspend, restart and shutdown
+# Suspend, restart, shutdown and lock the system
 #   
     bindsym $mod+escape exec systemctl suspend
     bindsym $mod+shift+r exec systemctl reboot
     bindsym $mod+shift+p exec systemctl poweroff
+    bindsym $mod+alt+l exec swaylock -f -C ~/.config/swaylock/config
 
 #
 # Screenshots