Dash Docset for pytest 3.10.1

Steps to generate

1. Clone https://github.com/pytest-dev/pytest and checkout the version you want to build docs for
2. Modify the pytest doc config file using dashify_pytest.patch as a guide
3. Create a pipenv using python 3.7.3 pipenv shell --python 3.7.3
4. Install deps for pytest
   • python setup.py install
   • pip install "sphinx<2.0" (had issues with older docset above 2)
   • pip install doc2dash
5. In pytest/doc/en: make html
6. Copy _build dir to a root directory in this project like pytest-3.10.1
7. Run the doc2dash command
   • doc2dash -A -n pytest --online-redirect-url https://docs.pytest.org/en/3.10.1/contents.html -i ../../icon@2x.png html/ -f