Implement Position Card Dashboard and Image Generation Script

[valarao]

Overview

This PR resolves #26 and implements the position cards. This PR also adds a script ImageGenerator, which was used to generate the position images for the dashboard.

Deployment Link

https://opening-trai-26-positio-nun2oz.herokuapp.com/

Future TODOs

• Turn ImageGenerator script into an endpoint for creating images with PGN notation attached to it
• Replace mock position data with real position data
• Add functionality for clicking on a position card