Add changes to seaice notebooks for new variables grid_file and path_nsidc. #169

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Task	Status
Have you followed the guidelines in our Contributor's Guide?	Completed
Have you checked to ensure there aren't other open Pull Requests for the same update/change?	Completed
Have you made sure that the `pre-commit` checks passed (#8 in Adding Notebooks Guide)?	Completed
Have you hidden the code cells (#8 in Adding Notebooks Guide) in your notebook?	Completed
Have you added an explanation of what your changes do and why you'd like us to include them?	Completed
Have you successfully tested your changes locally?	Completed
Have you moved any observational data that you are using to `/glade/campaign/cesm/development/cross-wg/diagnostic_framework/CUPiD_obs_data` and ensured that it follows this format within that directory: `COMPONENT/analysis_datasets/RESOLUTION/PROCESSED_FIELD_TYPE`?	Completed