Remove unused dependencies from Docker image

[tsalo]

Closes none.

Changes proposed in this pull request

• Drop ANTS, nitime, and skimage from the environment file.
  • We could probably drop node if we don't want the BIDS validator.
• Drop C3d from the Dockerfile.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 31.75%. Comparing base (096251d) to head (09f4bc5).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #30   +/-   ##
=======================================
  Coverage   31.75%   31.75%           
=======================================
  Files          24       24           
  Lines        2028     2028           
  Branches      298      298           
=======================================
  Hits          644      644           
  Misses       1374     1374           
  Partials       10       10           

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