Replace sphinx-redoc

[fmigneault]

Description

The API is currently documented by sphinxcontrib-redoc, but this plugin has not been maintained for years. The configuration options offered by native Redoc that would allow customizing the interface are not available because of this lack of maintenance.

Other plugins should be used.

Todo

• swagger-plugin-for-sphinx should be considered to use the Swagger interface and better customization options.
• sphinxcontrib-openapi should be used to provide the actual OpenAPI definitions direclty as documentation page.