docs: overhaul documentation

[DamianGlowala]

🔗 Linked issue

resolves #1709

❓ 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

PR bringing consistency across the docs (including grammar/formatting/code block corrections).

[cloudflare-workers-and-pages]

Deploying nuxt-image with    Cloudflare Pages

Latest commit:	60cf779
Status:	✅  Deploy successful!
Preview URL:	https://cd8d994e.nuxt-image.pages.dev
Branch Preview URL:	https://docs-overhaul.nuxt-image.pages.dev

View logs

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.19%. Comparing base (8341b16) to head (60cf779).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1710   +/-   ##
=======================================
  Coverage   64.19%   64.19%           
=======================================
  Files          79       79           
  Lines        3695     3695           
  Branches      424      424           
=======================================
  Hits         2372     2372           
  Misses       1295     1295           
  Partials       28       28           

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[danielroe]

this looks amazing!

might be worth adding some lint rules in a subsequent pr so this can be enforced in future