FR: disabling some features

[jelleroorda]

Feature request

Personally I'd love to remove some options for less technical users, to on the one hand make it easier to learn the page builder, and on the other hand to prevent them from 'ruining the design'.

To do this, I think one way could be to add some configuration flags. The easier way would however probably be to simply hide things in the CP by adding additional CSS. Would you guys be open to adding a few more specific CSS classes so this would be possible? This way I wouldn't have to write oddly specific CSS rules that are prone to breakage on more future updates.