In the React/frontend app implement the bar view

[ryanrolds]

Implement the first view in the "Joining Club story". Create handlers for clicking a seat, but don't worry about actually joining the room. We just want to get the UI in place. Once the signaling server supports groups we will wire up the join and leave logic. This view should be the home/first view of the React app.

[ryanrolds]

This is blocked until we finish getting the frontend stood up.