Make sure earthpy.get_data has documentation for url=

[lwasser]

is there a vignette that covers the get_Data function?? we should create one if not.

• show how to view all keys associated with data downloads via earthpy

• link to the data subset docs: https://earthpy.readthedocs.io/en/latest/earthpy-data-subsets.html

• Talk about how the download by default creates the earth-analytics directory

• show how you can use url= to download a file from a url. the file needs to be zipped!!