Quick plot example data

[zmoon]

The one used here

https://github.com/noaa-oar-arl/monet/blob/ccada51c4268f795c6a33fce7dbf2fcc29cc7417/docs/monet-accessor.rst?plain=1#L26

doesn't seem to be included in the repo anymore. Can we provide it another way or another example dataset?

cc: @bbakernoaa