split main CI into tests and docs

[tomkralidis]

Addresses #397

[maaikelimper]

I think we can reduce requirements-dev.txt for 'test docker deployment' to:
flake8
requests
pytest

If I understand correctly requirements-dev.txt contains the python-dependencies to run the integration test for the wis2box-stack, perhaps I could be located outside of the wis2box-managment-folder ?

The python requirements for docs could be managed in a separate requirements-doc.txt

[webb-ben]

Purpose of building docs in test workflow was because they were failing on commits to main. Why are the docs/ path commented out?

[tomkralidis]

The docs/ paths were commented so as to trigger docs CI in this PR. I've commented them out now that we have an approval.