reconfigure organization of workflows folder

workflows/add_zarr_asset_to_collection_zarr.ipynb

workflows/archive/create_catalog.ipynb

.../archive/create_collection_from_zarr_conus404-daily.ipynb

workflows/examples/create_catalog.ipynb

...examples/create_collection_from_zarr_conus404-daily.ipynb

workflows/examples/create_collection_opendap.ipynb

...flows/examples/create_item_from_zarr_conus404-daily.ipynb

workflows/examples/stac_data_access.ipynb