Remove DueCredit

[eurunuela]

This PR closes #53.

Follow-up work of adding BibTex citations should happen in #46.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.26%. Comparing base (90ca567) to head (0a86057).
⚠️ Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
- Coverage   90.30%   90.26%   -0.04%     
==========================================
  Files           3        3              
  Lines         299      298       -1     
==========================================
- Hits          270      269       -1     
  Misses         29       29              

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[tsalo]

LGTM. It looks like duecredit wasn't actually being used, so there are no specific citations to remove.

[eurunuela]

LGTM. It looks like duecredit wasn't actually being used, so there are no specific citations to remove.

That's right, but it was being imported by __init__.py, which is why I believe we could still see it when running tedana.