Added a .readthedocs.yaml config file for Enterprise

[vhaasteren]

This one solves #357 by adding a ReadTheDocs configuration file .readthedocs.yaml in the root directory. As of now, RTD requires that, and the CI tests fail here on github.

The content of the config file is below. It's just the default one would use for this kind of setup. Also added a requirements.txt for the docs building, which uses a theme.

# .readthedocs.yaml
version: 2

build:
  os: ubuntu-22.04
  tools:
    python: "3.10"

sphinx:
  configuration: docs/conf.py
python:
  install:
    - requirements: docs/requirements.txt

[codecov[bot]]

Codecov Report

Merging #360 (7fb147f) into master (257cf2f) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

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[vhaasteren]

@AaronDJohnson, this PR will fix the codecov errors in all the other open PRs, so let's merge this one to main if you approve.