[Remove] Proposal to remove `examples/NSIDC` from Earthdata Cloud Cookbook

[andypbarrett]

Content to remove

https://github.com/NASA-Openscapes/earthdata-cloud-cookbook/tree/main/examples/NSIDC

Rationale

The notebooks and associated code in this folder used outdated (pre-earthaccess) access patterns. I propose we move this directory.

Superseding notebooks

Any number of earthaccess tutorials or how-tos supercede these notebooks.

Migration plan

No response