records: updates templates for "big" files

* Adds files generated from `electronic_location`.
* Adds popup with warning for download.
  (addresses #377) (PR #676)
UI: update LHCb research intro text

* (closes #669) (PR #676)
templates: contact address display

* Includes the contact address in the about page.  (PR #675)
base: darker links for better contrast

* (addresses #656) (PR #668)