DX: define `docnblive` job in `tox.ini` #305

Job	Run time
pytest / Determine job matrix	4s
style / Determine skipped pre-commit hooks	7s
doc / nb / Execute and build documentation	1m 2s
doc / linkcheck / Check external links	1m 2s
pytest / Run unit tests (3.10, ubuntu-22.04)	1m 37s
pytest / Run unit tests (3.11, ubuntu-22.04)	1m 28s
pytest / Run unit tests (3.12, ubuntu-22.04)	1m 47s
pytest / Run unit tests (3.7, ubuntu-22.04)	1m 58s
pytest / Run unit tests (3.9, ubuntu-22.04)	1m 38s
pytest / Run unit tests (3.6, ubuntu-20.04)	1m 46s
pytest / Run unit tests (3.8, ubuntu-22.04, qrules)	4m 39s
pytest / Run unit tests (3.9, macos-12)	1m 55s
style / Run local pre-commit hooks	1m 3s
style / Run taplo through pre-commit	19s
doc / Upload to GitHub Pages	0s
style / Push changes	0s
	20m 25s

Provide feedback