Update tox.ini && conf.py file

[vladimirhasko]

Performed-by: gitea/infra/otc-metadata/tools/generate_doc_confpy.py

[otc-zuul[bot]]

Build succeeded. https://zuul.otc-service.com/t/eco/buildset/d3a8945ffae845f2841c5ae84b4b74c8

:heavy_check_mark: build-otc-umn SUCCESS in 5m 56s :heavy_check_mark: noop SUCCESS in 0s :heavy_check_mark: otc-tox-docs SUCCESS in 11m 36s