fix(azure): support custom baseURL

[danielroe]

🔗 Linked issue

resolves #1061
nuxt/nuxt#19385

❓ 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

This adds support for custom baseURLs by nesting the public directory with the correct prefix. (We still have to write our empty index.html in the root, though.)

📝 Checklist

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

[codecov]

Codecov Report

Merging #1062 (990cc99) into main (7a6c5b4) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1062      +/-   ##
==========================================
- Coverage   67.40%   67.32%   -0.09%     
==========================================
  Files          62       62              
  Lines        6283     6292       +9     
  Branches      707      707              
==========================================
+ Hits         4235     4236       +1     
- Misses       2034     2042       +8     
  Partials       14       14              

Impacted Files	Coverage Δ
src/presets/azure.ts	8.72% <0.00%> (+0.15%)	⬆️

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