myst sphinx extension broke pyvista display

[BenjMy]

Issue with myst_nb

• When incorporating myst_nb into the Sphinx configuration file, the gallery generated from Sphinx containing examples with pyvista plots fails to display them. This issue is resolved by commenting out myst_nb.

• The second problem concerns notebook examples from literature written in myst format. Disabling the extension prevents them from being properly read. Currently, the notebooks are converted to .rst format using JupyterLab and are not executed with Sphinx.