deposit: datetime picker library modification

• Changes the datetime picker library from the jQuery UI to bootstrap-datetimepicker.

• Increases the consistency with the Bootstrap design.

• NOTE introduces new JS library https://github.com/Eonasdan/bootstrap-datetimepicker.

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>
Co-authored-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>
Co-authored-by: Javier Martin Montull <javier.martin.montull@cern.ch>