single source of HyP3 tutorial

[yunjunz]

Currently, the following pages have links to HyP3-related documentation/tutorials, which are not consistent with the recommended ones from the HyP3 team. I would suggest the following changes to avoid potential confusions:

• https://mintpy.readthedocs.io/en/latest/dir_structure/#asf_hyp3: replacing the descriptions of "1. Search ...; 2. Clip ...; Here is an example ..." with one sentence pointing users to https://hyp3-docs.asf.alaska.edu/tutorials/

• On the MintPy-tutorial repo, remove the notebook example (https://github.com/insarlab/MintPy-tutorial/blob/main/smallbaselineApp_hyp3.ipynb), as it's redundant and not the latest recommended version.

• On the MintPy-tutorial repo's README: add another list item pointing users to https://hyp3-docs.asf.alaska.edu/tutorials/, and/or its linked notebooks.

What do you think? @asjohnston-asf @jhkennedy

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The HyP3 team recommends the Time series analysis with HyP3 and MintPy notebook linked from the Tutorials page of our documentation. It covers requesting and preparing data from HyP3 in greater depth.

Originally posted by @asjohnston-asf in #986 (comment)

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