Rename `icons` and `cats` to correct folder names in Prism

[RuiNtD]

The icons folders should be named iconthemes and the cats folders should be named catpacks to match Prism Launcher's folder structure.

I apologize, is this a question or an answer?

[RuiNtD]

The icon pack and cat pack downloads don't match the file structure that Prism Launcher is expecting.