Reference logger is no longer used

[tsalo]

Summary

The references in the decision tree JSON files are currently printed out with the references logger, but that was removed a bit before the DTM branch was merged. We can drop the RefLGR stuff, along with the references field of the decision tree JSON files, and just use \\citep{@bibtex} as in the reporting logger messages. The only potential issue is that the BibTeX entries would need to already be present in the boilerplate BibTeX file.

Additional Detail

Next Steps

1. Remove mentions/uses of RefLGR throughout tedana.
2. Add references to the report field of the decision tree JSONs as BibTeX citations.
3. Remove the references field.
   • What if we made the references field a list of BibTeX entries somehow, and then injected that into the boilerplate as we built the full references list?
4. Update the decision tree JSON documentation.