Binder "Getting Started" fails when loading "machine_learning/CL1.hdf5" about hyperspy-demos HOT 4 OPEN

To download it, go to the end of the notebook and execute the relevant cell. That's indeed not very clear...

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Indeed, it is clear in the 2_SVD_and_BSS.ipynb notebook, but not the 1_Getting_Started.ipynb!

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Just stumbled across the same. Can't we run at least the Getting_Started notebook with a dataset that is included in the repo? Otherwise we should put the cell for downloading the file at the right position.

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Instead of continuing with this type of data, we should use pooch instead, so that we can import data easily from hyperspy.dataset in the notebook demos as scikit-image does.

xref hyperspy/hyperspy#2816

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