tutorial hierarchical zarr stores

[eni-awowale]

cc @VeckoTheGecko, @ianhi and @keewis

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[eni-awowale]

Thanks for the review @keewis! Page is rendered here

[ianhi]

THis is overall very nice. One thought:

I felt a little lost jumping into the datatree as it is. In the tutorial itself we may have already introduced the datastructure. But for someone reading this page as a start I think it would be super helpful to have a bit of a problem statement at the start + description of the dataset:

THis is the dataset + this is why we need a datatree to support it

It might also be nice to state a bit more concretely that the data is not on their computer! but in the cloud and we only download what we actually need