Update URL of shortcuts svg (DeepLabCut#2408)

Author: jeylau

docs/napari_GUI.md

@@ -62,7 +62,7 @@ in red)
 - Check the box "display text" to show the label names on the canvas.
 - To move to another folder, be sure to save (Ctrl+S), then delete the layers, and re-drag/drop the next folder.
 
-![napari_shortcuts](https://github.com/Timokleia/DeepLabCut/assets/28102185/cafa97da-eb28-470f-8f9a-45d4ac7d91b7)
+![napari_shortcuts](https://images.squarespace-cdn.com/content/v1/57f6d51c9f74566f55ecf271/192345a5-e411-4d56-b718-ef52f91e195e/Qwerty.png?format=1500w)