Setup `dask` LocalCluster for local development

[alaws-USGS]

• [x] Add this before Intake catalog section
• [x] Look at previous forcings notebooks and copy Markdown language for creating a Dask cluster
• [x] Add a cell for running a Dask cluster in a local environment

  
  # check for existing Dask cluster
  if "client" in locals():
  print("Shutting down existing Dask cluster.")
  cluster.close()
  client.close()

cluster = LocalCluster() client = Client(cluster)

print(f"The link to the Dask dashboard is {client.dashboard_link}. If on HPC, this may not be available.")

- [x] Add Markdown cell that setting up a Dask cluster for other environments will be added later