Add a start stream button to frontend and hook up with backend

[M-Davies]

The skeleton is in place (#3), now we just need to ensure the frontend can actually utilise and query the backend. Since we'll be using S3 as a database, this will be considered complete when we can query the frontend and it will execute a backend script.

This involves hooking up startStream.sh with a frontend button that will begin the streaming process to aws

[M-Davies]

Due to the need to get the gesture recog functioning ASAP, I'm going to make the executive decision to push this back to Sprint 5 and pull #6 into this sprint so we have a baseline to work with

[M-Davies]

Python backend is done. This can be moved into the current sprint