Add metadata standard selector for Research Outputs

[mariapraetzellis]

[briri]

I am struggling to find an appropriate API to use for the metadata standard. The task in our codebase points to an endpoint on dmponline-test that is no longer available:

roadmap/lib/tasks/initialize_data.rake

Line 16 in 2a65499

rda_q.description = "https://dmponline-test.dcc.ac.uk/rda/api/" # TODO: Update to permanant API address once HTTPS is added

@raycarrick-ed or @martaribeiro do either of you know what URL this should be? The value should be in your question_formats table