No longer allow `url_for` to be used in news item bodies
No longer allow `url_for` to be used in news item bodies

Insert static URLs (relative or absolute) instead.

This removes a dependency from the news service to the public web frontend.

m-ober/byceps,m-ober/byceps,homeworkprod/byceps,homeworkprod/byceps,m-ober/byceps,homeworkprod/byceps