leaderboard.csv file no longer caches

[jojo259]

Previously the leaderboard.csv file would cache for 10 minutes. Now, it doesn't cache at all, which slows down page loading significantly. I think the code needs to be changed to explicitly cache regardless of what the server says, otherwise it relies on whatever GitHub Page's default caching is.

Edit: I am seeing cache-control: max-age=300 in the response headers but my browser isn't caching it. Not sure if this is just an issue/configuration with my browser, but it consistently doesn't cache on both my desktop and phone, so each page load takes a long time.