Extract question routes to reduce clutter

[tsulim]

Changes

• Extract out question routes from index.js in backend to reduce clutter
• New folders: controller and routes

Additional information

controller

• Contain the business logic for handling requests and generating responses.
• They perform tasks like querying the database, processing data, and returning responses to the client.

routes

• Group similar ones together and handle the routing of HTTP requests to the appropriate controller functions.
• They define the endpoints and HTTP methods (GET, POST, PUT, DELETE) for your application.