Replaced "Discover" with "Charts" and removed old categories

[Lucatacos]

Changes

It's been a while since it's been "Charts" instead of "Discover", and I removed "Most Engaging" and "Roleplay" since they no longer exist on the Charts page.

Checks

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[IgnisRBX]

Hi @Lucatacos ,
We've decided to remove this entire page, so I'll close this PR. Thanks for flagging it!