Add jupyterlite-ai to lite deployment

[arjxn-py]

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• PR description contains references to any issues the PR resolves, e.g. Resolves #XXX.
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📚 Documentation preview: https://jupytergis--993.org.readthedocs.build/en/993/
💡 JupyterLite preview: https://jupytergis--993.org.readthedocs.build/en/993/lite

[github-actions]

👈 Launch a Binder on branch arjxn-py/jupytergis/add-jupyterlite-ai

[github-actions]

Integration tests report: appsharing.space

[martinRenou]

Let's wait for #969 to be in first

[arjxn-py]

Let's wait for #969 to be in first

I think no harm to get this in first, since then we would also be able to test #969 a bit before merging it?

[martinRenou]

Can you include jupyterlite-ai in #969 directly then?

jupyterlite-ai alone cannot be used so I'm not sure it sends a good signal to people hitting the docs url