Add more specific illustration design guidelines
https://design.gitlab.com/foundations/illustration is still empty
Besides structural differences in empty states (see #115 (comment 105509332)) which will be gradually tackled using the recently introduced empty state component in gitlab-ui!106 (merged), empty state illustrations still vary in size (live area, bounding box, and more) which leads to more inherited inconsistencies. See gitlab-ui#177. Following the need for more specific icon design guidelines in #113, illustration design guidelines could help eliminate inherited inconsistencies.
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