Feature request: autoplay next playlist scrim

[webfliccy]

When adding videos to a playlist enable autoplay to next scrim outside a course
Currently:

1. it is less effective to send an individual scrim link, must send playlist link if want users to be able to easily consume more than one scrim on a topic
2. disincentive for community instructors to create content on scrimba, your docs which say users can "binge" when watching a playlist is incorrect
3. Disrupts flow of learning