Refactor registry

[jdeschamps]

• Refactor registry
• Change test sample
• Add comments to registry
• Add python function to export
• Update readme

[codecov]

Codecov Report

Patch coverage: 94.44% and project coverage change: +0.20 🎉

Comparison is base (a355a60) 93.67% compared to head (9cc4712) 93.87%.

❗ Current head 9cc4712 differs from pull request most recent head 7564e20. Consider uploading reports for the commit 7564e20 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   93.67%   93.87%   +0.20%     
==========================================
  Files           8        8              
  Lines         332      343      +11     
==========================================
+ Hits          311      322      +11     
  Misses         21       21              

Impacted Files	Coverage Δ
src/careamics_portfolio/portfolio_entry.py	94.02% <ø> (+1.49%)	⬆️
src/careamics_portfolio/utils/pale_blue_dot.py	100.00% <ø> (ø)
src/careamics_portfolio/portfolio.py	88.59% <90.90%> (+0.01%)	⬆️
src/careamics_portfolio/__init__.py	100.00% <100.00%> (ø)
src/careamics_portfolio/utils/__init__.py	100.00% <100.00%> (ø)
src/careamics_portfolio/utils/download_utils.py	100.00% <100.00%> (ø)

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