docs: more improvements

[Atinux]

🔗 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 like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

• Improved many things, simplify the Guide to avoid multi level where it is not needed
• Added icons ✨
• Fix links
• It looks much better on mobile too:

[nuxt-studio]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
nitro	Edit on Studio ↗︎	View Live Preview	1d21c00

[codecov]

Codecov Report

Merging #1039 (1d21c00) into main (591f9aa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1039   +/-   ##
=======================================
  Coverage   67.20%   67.20%           
=======================================
  Files          62       62           
  Lines        6287     6287           
  Branches      707      707           
=======================================
  Hits         4225     4225           
  Misses       2049     2049           
  Partials       13       13           

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[pi0]

Love it!