Set ipython3 as "calculator" (XF86Calculator) hotkey

dotfiles/config/i3/config

@@ -380,6 +380,7 @@ bindsym $mod+Shift+d        exec "$spn bmo menu ddg"
 bindsym $mod+period         exec "htopnow"
 bindsym $mod+x              exec "mousepad"
 bindsym $mod+slash          exec "pavunow"
+bindsym XF86Calculator      exec "twinner ipython3"
 
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 ## WWW magic mind readers                                               ##