Write demo that includes all element types and describes how they work.

[JamesPHoughton]

We have a demo treatment specified in projects/example/treatements.demo.yaml that we can use to show off the capabilities of the project. It should be something that we can use for a

We'll probably need to specify a few different treatments, for different numbers of players (2, 3, 4).

Show off each of the different elements:

• Audio element
• Discussion
• Maybe re-entry to discussion
• KitchenTimer
• Prompt
• Qualtrics
• Separators and Submit Button
• Surveys
• Talk meter
• Training video

Show off different capabilities:

• Showing different elements to different people
• Having elements appear at different times

[JamesPHoughton]

Splitting this into two demos: one that is heavily annotated and uses most of the features of DL. The other just showcases prompt types.