Remove deprecated `Camera3dBundle`, `DirectionalLightBundle` from `nannou` crate

[mitchmindtree]

Bevy says these were deprecated in favour of using the assets directly now that all of the components are automatically inserted alongside the assets. It's not super clear to me how we'll go about updating for this though 🤔

[tychedelia]

This is kind of annoying because we are using these as ways to return groupings of components for the user to edit. This is one of the friction points between the Nannou App model and Bevy. E.g. there's no such thing as a "camera" in bevy it's a collection of components but that's hard to expose.