Deprecate repo in favor of migration to nsidc-data-tutorials

[asteiker]

The DUE team recently updated the notebook content from this repo over to: https://github.com/nsidc/NSIDC-Data-Tutorials/tree/main/notebooks/SMAP.

@andypbarrett suggests:

Probably a good idea to remove old repo. Or remove references to it from notebooks and let original repo go stale.

We will also need to consider the existing references to this notebook as part of NSIDC's tool and service metadata and ensure those are updated accordingly. This work should be dependent on further updates to these notebooks in progress via CRYO-187.

NSIDC Jira issue: CRYO-207