Each official document page needs a link to the code.

[AtsushiSakai]

We need to find a better way with Sphinx function.

[AtsushiSakai]

sphinx.ext.linkcode https://www.sphinx-doc.org/en/master/usage/extensions/linkcode.html

might be an answer.

[AtsushiSakai]

Framework is ready, we need to add file links to all documentation.