Fix names and paths in examples

[tsalo]

Changes proposed:

• Fix paths and names in examples.
• Add example for CIFTIs.
• Consolidate to-modelarray and from-modelarray arguments into functions.
  • --workers and --s3-workers are not always used.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.71429% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.19%. Comparing base (1076906) to head (13b7e58).

Files with missing lines	Patch %	Lines
src/modelarrayio/cli/h5_to_mif.py	55.55%	4 Missing ⚠️
src/modelarrayio/cli/mif_to_h5.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
- Coverage   61.95%   61.19%   -0.76%     
==========================================
  Files          16       16              
  Lines         962      951      -11     
  Branches      136      137       +1     
==========================================
- Hits          596      582      -14     
- Misses        329      332       +3     
  Partials       37       37              

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