Overcoming sphinx-gallery build time and memory constraints

[AhmetNSimsek]

The pull request #265 temporarily fixes the autodoc timeout failure during sphinx gallery. Ideally, the examples should not comprise the content. @xgui3783 had an idea of possibly having a dedicated runner: #265 (comment)

[AhmetNSimsek]

As of 0588aca, SparseIndices are taken from a gitlab repo and saves considerable amount of computing time. Therefore, this issue is now not urgent but remains to be a bottleneck.

[AhmetNSimsek]

As of 206c3ff, this issue became urgent again. Especially, since two more time-consuming examples will be added with #445 and #442.

[AhmetNSimsek]

@xgui3783, What do you think of creating the docs with CI and host the doc on github pages?
https://coderefinery.github.io/documentation/gh_workflow/

[AhmetNSimsek]

Solved with 3978712