Move "Layan" folder to "themes" subdirectory

Created by: ShayBox

Move aurorae/Layan to aurorae/themes/Layan

Provided install script copied the folder to this directory already, but because the source folder structure didn't match it requires copying each folder separately, now you can just copy the entire folder into /usr/share/ or .local/share/, making it easier for third party installation scripts to install, or users to manually install.