A3 1589 add articles to kids

Add articles to the list of source systems that is eligible to be rendered in ActiveKids
This is an incorrect highlighting of the changes by github. What really happened here is that kids_interest? got moved to the bottom as a private method, and the line

(activenet? || awcamps? || awcamps30?) && kidsinterest?

got replaced by

kids_friendly_source_system? && kids_interest?