📸 Add Camera defocus blur + Other

Just wanted to add defocus blur but ended up changing a bunch of other
this as well.

- Moved scenes to a separate folder.
- Updated readme with more pretty images.
- Add interface for loading scenes. There is currently one for yaml
  and another if you want a slightly random scene.
- Add image action to decide what to do with the final image once its
  rendered. Currently supports just showing the buffer until you press
  the render buffer again and saving the image as `png`.
- When you use nix shell you will be dropped in the proper folder so
  you can just do cargo build etc without having to do `cd`.

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