Update documentation to describe all public functions / improve API doc

[iMicknl]

We should investigate if there is a way to generate an API doc automatically based on our doc strings.

[tetienne]

We can use https://www.sphinx-doc.org/en/master/ and host the documentation on gh page.

[pzim-devdata]

I have explain here : #759 how to control with Python many Tahoma's accessories if it can help. Thank you again ! :-)