Replace .csv in ckan api

[KarenJewell]

Is your feature request related to a problem? Please describe.
Currently, the ckan api script (ckan.py) outputs to a .csv which is then ingested into merge_data.py. This should be converted to a .json output to keep consistent with the rest of the project.

Describe the solution you'd like

• Change the output of ckan.py to be a .json file
• Update merge_data.py to ingest the new .json file
• format code with Black before PR
• update docs (architecture.md and datapipeline.png)

Describe alternatives you've considered
None

Additional context
Original ticket triggering this change is #163