Update marketplaceCategories.js

[flikites]

Added minecraft category to marketplace category list

[Cabecinha84]

Tom, don't you think just using current game category is enough? I don't know if create a specific Minecraft category is needed. Cheers

[flikites]

Their are multiple server types that would be offered eventually (Vanilla, Cat, Spigot, Paper,etc.)

As a marketer I think a separate one is needed, but its ultimately up to you and Nolan to determine this.

[sygem]

Subcategories could potentially be an option in the new marketplace UI