This PR sets up React in our BlueSurf application and reorganizes our folder structure! Closes #39.

From here on forward, we will have a backend directory which will store all the flask app and database and also the src/ folder which will hold all react components and related utils.

There are some prerequisites to run the react app locally:

• In one terminal, run npm install followed by npm start to start the frontend/ react app on localhost:3000
• Open another terminal session, npm run start-backend to run the backend on localhost:5000

Note: remove the "proxy": "http://localhost:5000" from the package.json file if you see an Invalid options object. error when trying to start react app