Location for `overrides.json` file when using JupyterLite and JupyterBook?

[firasm]

What I am trying to do...

Hello, I'm trying to put together a demo where a jupyter notebook auto-launches to "Deck Mode" at startup using JupyterLite and JupyterBook.

I've gotten as far as enabling the extension with JupyterLite (live demo here):

now I'm at the last step of trying to figure out where to put the overrides.json file

{
  "@deathbeds/jupyterlab-deck:plugin": {
    "active": true
  }
}

I've tried putting the file in the following location (I had to create the settings folder and the overrides.json file):

jb_jblite_jupyterlabdeck/_build/html/lite/lab/settings

But it doesn't seem to work - any ideas on where this overrides.json file should go?

Demo so far...

What I've got working so far can be found here: https://github.com/firasm/jb_jblite_jupyterlabdeck.git

Thanks for any help you can provide - and for creating such a great extension!