Hard dependency on org-id guide site

[michaelwood]

The dataquality tool has a hard dependency on http://org-id.guide/download.json, if this is unavailable the tool doesn't degrade gracefully.

    from lib360dataquality.cove.threesixtygiving import (
  File "/home/datastore/datastore/.ve/src/lib360dataquality/lib360dataquality/cove/threesixtygiving.py", line 37, in <module>
    orgids_prefixes = get_orgids_prefixes()
  File "/home/datastore/datastore/.ve/lib/python3.8/site-packages/libcove/lib/common.py", line 1409, in get_orgids_prefixes
    org_id_file_contents = requests.get(orgids_url).json()