Checklist

• My pull request has a clear and explanatory title.
• If necessary, my code is vectorized.
• I added appropriate unit tests.
• I made sure the code passes all unit tests. (refer to comment below)
• My PR follows PEP8 guidelines. (refer to comment below)
• My PR follows geomstats coding style and API.
• My code is properly documented and I made sure the documentation renders properly. (Link)
• I linked to issues and PRs that are relevant to this PR.

Description

This PR should fix issues #1243, #1294 and #1659 by creating the .rst files of the geomstats api

The command "sphinx-apidoc -o docs/api geomstats" generates the .rst files of the api.
It must be executed before the sphinx-build.
The local tests I made on my windows computer seems to work fine, however there could be some tuning to do to make it work on the server (most espcially writing the directory names)

Additional thoughts:

• the display is maybe not the best, other PR's could be needed to render the output better

Issue

#1243, #1294 and #1659
This fix will allow the api documentation to be in sync with any new approved commits in geomstats

Additional context