Execute tutorials before publishing on readthedocs

[felix-andreas]

Was not fixed by #88
Supersedes #35

Sphinx-Gallery examples can be executed. This does currently not work on the readthedocs cli because of the C extensions:

readthedocs log

ModuleNotFoundError: No module named 'apace._clib'

https://github.com/andreasfelix/apace/blob/cb0edb9a766eee65eb09fcba339660eca0925dde/docs/conf.py#L45-L46

Solutions

• execute files locally and somehow push them to readthedocs
• make it work on readthedocs