feature: check if provided links work
When selecting a resource, for example an expert like (ID https://orcid.org/0000-0002-3704-3990) some of the provided weblinks dont work (in that the example http://www.ocean.uni-bremen.de/mitarbeiter/rsteinf/index_rst_eng.html throws an 404).
It would be cool if we can check them and (in the front end) either hide them, or (better) show them and indicate that we know its broken (some little icon next to the link with some info).