chore: Revert to upstream nifti-reader-js

[effigies]

@nellh I think your PRs all got merged? They do an annoying thing where they put compiled results in the source directory, so merging in master was a bit of a pain and I'm not sure I did it right.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 86.99%. Comparing base (c8fcef3) to head (4162fb3).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #296   +/-   ##
=======================================
  Coverage   86.99%   86.99%           
=======================================
  Files          50       50           
  Lines        3721     3721           
  Branches      610      610           
=======================================
  Hits         3237     3237           
  Misses        475      475           
  Partials        9        9           

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