Add catalystcoop.pudl_catalog to our JupyterHub

[zaneselvans]

Once we have an initial release of the data catalog on PyPI / conda-forge (see #10):

• [x] Add catalystcoop.pudl_catalog to the environment specified in the pudl-examples repo which builds the Docker container for our JupyterHub.
• [x] Test accessing the cloud data on the JupyterHub both using pd.read_parquet() and through the Intake catalog, both for the monolithic and partitioned datasets, with and without caching turned on to see what the user experience is like.
• [x] Make this the default way of accessing the EPA CEMS data on the JupyterHub, so we can reduce our disk usage and avoid the hassle of uploading new data to the hub whenever we do a data release.

[zaneselvans]

I ended up adding a local copy of the data to the shared folder so that the catalog can be pointed there, rather than having folks potentially cache multiple different copies of the data in different user spaces. It's also faster locally, and catalog access works just the same.

Updated the notebook and jupyterhub configuration. Still waiting on conda-forge distribution of the catalog though.