Remove unused marker bindings

dotfiles/i3/config

   set $item     "<span foreground='#999999'></span> %title"
   set $favorite "<span foreground='red'></span> %title"
 
-  bindsym m     exec i3-winmark mark   ; mode "default"
-  bindsym u     exec i3-winmark unmark ; mode "default"
-  bindsym g     exec i3-winmark goto   ; mode "default"
-
   bindsym Page_Up [workspace=__focused__] \
                         title_format $neutral; mode "default"
   bindsym Page_Down [workspace=__focused__] \