search: fix browse pagination links

* Addresses issue with browsing results using next/prev links without
  field name.  (closes #1824)

Co-authored-by: Petr Broz <petr.broz@gmail.com>
Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
deposit: assets import clean-up

* Changes js and css import to use url_for.  (closes #1817)

Signed-off-by: Kamil Neczaj <kamil.neczaj@cern.ch>
Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>