Add smaller step resize bindings

dotfiles/i3/config

         bindsym Down        resize grow     height  200 px or 12 ppt
         bindsym Up          resize shrink   height  200 px or 12 ppt
         bindsym Right       resize grow     width   200 px or 12 ppt
+        bindsym Shift+Left  resize shrink   width   25 px or 2 ppt
+        bindsym Shift+Down  resize grow     height  25 px or 2 ppt
+        bindsym Shift+Up    resize shrink   height  25 px or 2 ppt
+        bindsym Shift+Right resize grow     width   25 px or 2 ppt
         bindsym Return      mode "default"
         bindsym Escape      mode "default"
 }