Improve README

[PythonFZ]

• on/off graph dataclasses
• integration with paraffin
• how dvc and params files look like / more examples, e.g from readme
• tip on how large a node should be
• zntrack.apply
• something about modern python, typer, fastapi, sqlmodel,... copy text
• everything goes through files, example for how to bring stuff on the graph, tip on outs/inps/run multiple methods to split complexity
• diff between pparams and deps, currently a bit hidden
• config.always_cache
• self.state.fs
• self.state.restarted
• node-meta.json

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.25%. Comparing base (3433220) to head (f4403c0).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #878      +/-   ##
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- Coverage   90.45%   90.25%   -0.20%     
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  Files          32       32              
  Lines        1698     1694       -4     
  Branches      293      293              
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- Hits         1536     1529       -7     
- Misses        162      165       +3     

Flag	Coverage Δ
fulltest	90.25% <ø> (-0.20%)	⬇️

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