Advanced Topics: Batch correction example

Would be good to show examples of how to correct for batch effect. For this example, we would use refinebio data that is aggregated by species. Presumably include some sort of initial litmus test of sorts that if followed, would help identify whether batch correction is needed in the first place.

No file, test, or entry point is named. Start by reviewing the repository's existing example workflows and define the refine.bio species-aggregated batch-correction example, including the proposed initial litmus test; done means the example and guidance clearly show when and how batch correction is needed.

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