Add prefix url

[moedarrah]

The prefix URL is functioning correctly, and its value is controlled by the environment variable REACT_APP_PREFIX_URL. I set the value to / to prevent the URL from being impacted and interfering with Firebase hosting actions. When we run the project in production, we can add a value.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit a6fa18b):

https://sc2reporter--pr113-prefix-url-asvm5n0y.web.app

_{(expires Wed, 22 Feb 2023 09:17:25 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: 6d20d9e74d601eec7a9f9a91c238800052879dd7}