example for opening, downscaling and visualizing a high-res model

[keewis]

With xarray-contrib/xdggs#141, the notebook should become quite a bit easier.

To reproduce on a jupyterhub:

curl -fsSL https://pixi.sh/install.sh | sh  # restart shell after completion
pixi workspace export conda-environment -e nicam env.yaml
mamba env update -n notebook -f env.yaml

or run

pip install 'xdggs @ git+https://github.com/keewis/xdggs.git@test'