Move required Suggestion UI into DP+ proper

For the DRUF to be fully deployed, it requires the Suggestion UI (built with Bootstrap Popovers) Jinja2 template.

Currently, these templates and the associated Javascript/CSS is in our fork of ckanext-scheming.

To make it easier to deploy the "DRUF", have it in DP+ instead.

This should make it far easier to deploy DP+ and have scheming users adopt it.