No RTD doc for the web API

[GuillaumeDerval]

The API is well-defined in the code, but it would be nice to have it in ReadTheDocs. It would also allow us to add bits of useful information, such as the fact that #470 exists.

[jy95]

I can recommend you to use the Open Api specification (aka OAS) for that purpose.

Two extensions already exist to convert OAS file into a page for RTD :

• sphinxcontrib-redoc
• sphinxcontrib-openapi