Lesson header is a link.
Destroy lessons if course is destroyed.
Add stubbing factories to automatate sample data generation.

This allows to prototype data analysis/visualization features with useful data.
It also allows fast creation of sample course for potential clients to demo.
Improve textarea styling.
Add full student data in feedbacks API response.
Improve Feedback Data UI.
Add active icon signifier for lessons list.
Merge branch 'dev' into deploy
assets