Fix broken link about lunar day, and remove dead link to NASA dataset interoperability

[brian-rose]

Closes #494

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[brian-rose]

There's another broken link now... will try to fix.

[brian-rose]

I removed a link in the final "References" section of the NetCDF notebook. The link was to something related to NASA dataset interoperability recommendations for earth science. I'm not sure exactly what was linked. A google search on this topic yielded a number of different technical documents, but it wasn't clear to me that there was a lot of value in promoting these as recommended follow-up reading for our chapter.

[dopplershift]

Looks like this contains the recommendations extracted from the original. Not sure if it's worth linking.

[brian-rose]

Not sure if it's worth linking.

In my opinion, no. It's a technical report from a technical working group, not a tutorial document.