fix(prerender): respect output path from main preset

[danielroe]

🔗 Linked issue

nuxt/nuxt#19883

❓ 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 like performance)
• ✨ 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

At the moment we hard code nitro-prerender preset command to assume a certain directory structure. This respects the 'host' nitro preset output directories to produce the preview command.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #1114 (fab6eba) into main (c2e1e7c) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1114      +/-   ##
==========================================
+ Coverage   67.63%   67.66%   +0.03%     
==========================================
  Files          63       63              
  Lines        6364     6370       +6     
  Branches      711      712       +1     
==========================================
+ Hits         4304     4310       +6     
  Misses       2045     2045              
  Partials       15       15              

Impacted Files	Coverage Δ
src/presets/nitro-prerender.ts	100.00% <ø> (ø)
src/prerender.ts	89.28% <100.00%> (+0.32%)	⬆️

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