How to link a jupyter-notebook with a card (sphinx-design)

[RemDelaporteMathurin]

Hi all,

I'm using nbsphinx to import notebooks as examples in my documentation. Now I would like to have cards on the home page linking to these notebooks:

.. grid:: 3
    :gutter: 2

    .. grid-item-card:: Example 1
        :img-bottom: _static/tritium_model.png
        :link: examples/notebook1.ipynb
        :link-type: ref
        :text-align: center

    .. grid-item-card:: Example 2
        :img-bottom: _static/optimisation.png
        :link: examples/notebook2.ipynb
        :link-type: ref
        :text-align: center

I get the following error:

/home/remidm/libra-toolbox/docs/index.rst:16: WARNING: undefined label: 'examples/notebook1.ipynb' [ref.ref]
/home/remidm/libra-toolbox/docs/index.rst:22: WARNING: undefined label: 'examples/notebook2.ipynb' [ref.ref]