source_url does not necessarily align with source_note

[reginafcompton]

We add the source_url by looking for the link to the web interface (rather than the api - might be worth asking why?):
https://github.com/datamade/django-councilmatic/blob/master/councilmatic_core/management/commands/import_data.py#L954

However, the source_note (determined by looking at the 0th position in sources) does not necessarily return "web." https://github.com/datamade/django-councilmatic/blob/master/councilmatic_core/management/commands/import_data.py#L992

(n.b., hopefully, issues like these will be resolved, upon implementation of isolated databases – documenting the issue, nonetheless)