Add example notebook for the new regridding workflow

[LOCEANlloydizard]

Now that we have regridding option (Refs #726 and this PR, it would be nice to implement a notebook demonstrating how to use this new functionality in practice (e.g. from Sv computation to regridded outputs and plots) ?

[leewujung]

I agree - I wonder if it would be worthwhile to add this in addition to the compute_MVBS part in the getting started notebook, so that people can see how the 2 methods differ? also because regrinding is such a common procedure at the beginning of many workflows.

[LOCEANlloydizard]

thx @leewujung, I added a quick example to the getting started notebook in #114, along with a link to the dedicated resample_to_geometry notebook! Once this PR is merged, we can close this issue as Resample to geometry (#101) has already been merged; cheers!