Describe the solution you'd like
When lessons and courses are linked to, we currently use their description. This is very long and gets cut off on social media platforms like Facebook, LinkedIn, and Twitter. We should have a "summary" that describes, in 110 characters or less, what the course or lesson is about.

Describe alternatives you've considered
We already have this wired up for

This will allow students to navigate the repo structure easily, without having to come back to the main repo each time.