Notebook support

[sverhoeven]

For documentation I like to write Jupyter notebooks to show the usage. It would be nice if the template was aware of notebooks.

Places I can think off that could be made notebook aware:

• linter, for example see https://github.com/eWaterCycle/ewatercycle/blob/ce0fd1e2e7b9819db15437efa47d405938131d8c/pyproject.toml#L137
• sphinx docs, for example see https://github.com/eWaterCycle/ewatercycle/blob/ce0fd1e2e7b9819db15437efa47d405938131d8c/docs/conf.py#L26
• pre-commit, for example see https://github.com/eWaterCycle/ewatercycle/blob/ce0fd1e2e7b9819db15437efa47d405938131d8c/.pre-commit-config.yaml#L26-L29

Nice to have

• have command to run notebooks with coverage