Add sphinx_copybutton dependency · mathLab/PINA@9e87d61

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

An option to automodule is either unknown or has an invalid value: 'no-index'

An option to automodule is either unknown or has an invalid value: 'no-index'

Unknown interpreted text role "raw-latex".

Unknown interpreted text role "raw-latex".

Unknown interpreted text role "raw-latex".

Unknown interpreted text role "raw-latex".

Unknown interpreted text role "raw-latex".

Pygments lexer name 'ipython3' is not known

Pygments lexer name 'ipython3' is not known

Pygments lexer name 'ipython3' is not known

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