Rework json map path logic

[OCopping]

This PR reworks the JsonMap logic to use relative paths to the write directory.

Depends on #162 for cleaning of generated files.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.72%. Comparing base (19e41c4) to head (d6a94b4).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/techui_builder/builder.py	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #177      +/-   ##
==========================================
- Coverage   81.73%   81.72%   -0.02%     
==========================================
  Files           9        9              
  Lines         668      673       +5     
==========================================
+ Hits          546      550       +4     
- Misses        122      123       +1     

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