Incorporate suggestions from JOSS review

[CDJellen]

Summary of core changes:

• Improve the default response format of available_realtime to return a list of the modes supported by a given station. full_response=True returns the URLs for available station, optionally as a dataframe.
• Update the parameters in API methods to reflect the migration from the netCDF4 package to the xarray package.
• Expose xarray keyword arguments to the save_xarray_dataset method.

Bugfixes:

• None noted; some documentation updates to better reflect what parameters are used.

Future improvements:

• None noted.