refactor: convert <NuxtPicture> to SFC

[DamianGlowala]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Converts <NuxtPicture> to SFC with script setup for more familiar/user-friendly syntax.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 65.81197% with 40 lines in your changes missing coverage. Please review.

Project coverage is 62.22%. Comparing base (52321bf) to head (668a02f).

Files	Patch %	Lines
src/runtime/components/NuxtPicture.vue	63.96%	40 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1432      +/-   ##
==========================================
- Coverage   62.24%   62.22%   -0.03%     
==========================================
  Files          79       79              
  Lines        3597     3595       -2     
  Branches      394      390       -4     
==========================================
- Hits         2239     2237       -2     
  Misses       1328     1328              
  Partials       30       30              

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