Configure im-table cell URL value to link to URL instead of report page

This existed before, and I think Gos wants it for Bluegenes as well.

When adding this, we should reference how the configuration was done for the old webapp.

https://intermine.readthedocs.io/en/latest/webapp/query-results/#index-0
> **links**
> Only unique fields (class keys) are links in results pages. Add to [Class keys](https://intermine.readthedocs.io/en/latest/webapp/properties/class-keys/) to make the fields links on results pages. Instead of linking to an intermine report page, you can set the links to redirect to external page. See [Link redirects](https://intermine.readthedocs.io/en/latest/webapp/query-results/redirects/)

Start by reviewing the linked old webapp documentation, especially the links and Link redirects sections, then inspect how im-table cell URLs are configured in Bluegenes. Done means URL-valued cells link to the configured external URL instead of an InterMine report page, with the behavior available for Bluegenes.

Written by the indexing model from the issue text.