EnsembleGeoseries dashboard() doc does not showcase an EnsembleGeoSeries

[CommonClimate]

Describe the bug
The documentation for EnsembleGeoSeries dashboard uses the EDC dD, which is a plain vanilla GeoSeries instance, not an EnsembleGeoSeries instance.

Proposed solutions

• make an artificial ensembleGeoSeries (look at the pytest fixtures for an example)
• use pyleo.utils.tsmodel.random_time_axis() to generate a small age ensemble around EDC-dD