Implement redirect to the rendered image page.

[jumbatm]

Once the user has uploaded a JSON file and the scene information cache has the file, the server needs to send the client to the page where their rendered image will show up.

• [x] Set up an renders/:uuid endpoint. Make the uuid parameter of the request available inside the body of the middleware function.
• [x] When the file uploads, have the server tell the client what their UUID is. The server should then send the client to /renders/<their uuid>
• [ ] For now, have a dummy page which just says "Your UUID is ${uuid}".

Related to #3, #5

[jumbatm]

A quick Google online shows that, on the client side, you can use window.location = ${url}; to trigger a redirect to another page.