In tarensanders/screen_viz: Visualise the Screen Time Review of Reviews Data

Some things to keep in mind:

This is using 'simulated' data because the format of the dataset isn't exactly right. But, the exposure/outcome combinations are only those that occur in the data.
When you reach the 'deepest' part of the graph, clicking on an exposure/outcome combination should bring up the associated metadata, but it's not implemented yet. That screen is next on my list.
There's currently no filter for age, but this is on my list.
The CSS works OK for normal size screens, but is not responsive enough for mobile.
Some components are a bit laggy, but that will be fixed down the road.
You can view the full-page version of the app here.