Add satpy example?

@djhoese any interest?

There is also https://examples.dask.org/applications/satellite-imagery-geotiff.html , but maybe there is more that we could add there or other examples that we could add.

As a reminder, examples in dask-examples are tested, rendered statically to serve from examples.dask.org, and available for users as runnable binders. It's nice way to reach users, and a nice way to have a simple test with many other parts of the ecosystem.