Feature Request: Button to shuffle categories

[xuanswe]

It would be nice to be able to shuffle the categories. I mean only the categories, NOT the order of problems inside each category.
Normally, we could split our DSA interview study into 2 rounds:

1. Learning with easy questions
   I think we shouldn't use this feature in this round.
2. Practicing with medium then hard questions:
   In this round, randomness (emphasis, only categories, not the content inside each category) could be very helpful to many people like me, especially when combine with Option to show/hide the category names #336.

[xuanswe]

@neetcode-gh I would like to create PR to the website code but couldn't find it. Do you also want to opensource your website code?

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