Use a nicer datetime picker

AssetBundle required in AppKernel:
new Integrated\Bundle\AssetBundle\IntegratedAssetBundle(),

Remove from config.yml:

• @IntegratedFormTypeBundle/Resources/public/components/smalot-bootstrap-datetimepicker/js/bootstrap-datetimepicker.min.js

• @IntegratedFormTypeBundle/Resources/public/js/datetimepicker.js