This PR moves illustrations from sections to a separate folder of their
own and accesses which illustration to load on a specific page using a
registry.
The reason for this change is that we want to be able to independently
style each illustration since shared styles being applied to nine
illustrations of ThreeCards, for example, does not get us the eventual
output visually that we're after because the underlying assets have
different lighting, angles etc.
Once we're at a position where we know what can be reused, I will
refactor. For now, Thomas would to take illustration styling to try and
implement what he has in mind, so isolating these files for him to work
without breaking anything.
Abdullah.
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