revert back to SendKeystrokes to show off that feature

Also remove !menu as it's unlikely to be a problem in this case and
muddies the example

assets/keymaps/initial.json

@@ -13,7 +13,7 @@
     }
   },
   {
-    "context": "Editor",
+    "context": "Editor && vim_mode == insert",
     "bindings": {
       // "j k": ["workspace::SendKeystrokes", "escape"]
     }