docs: add sessions usage

[Barbapapazes]

🔗 Linked issue

fix #1444

❓ 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

📝 Checklist

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

[nuxt-studio]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
nitro	Edit on Studio ↗︎	View Live Preview	3eba51a

[codecov]

Codecov Report

Merging #1445 (3eba51a) into main (e87e2ba) will increase coverage by 0.11%.
Report is 36 commits behind head on main.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1445      +/-   ##
==========================================
+ Coverage   76.17%   76.28%   +0.11%     
==========================================
  Files          73       73              
  Lines        7437     7540     +103     
  Branches      728      739      +11     
==========================================
+ Hits         5665     5752      +87     
- Misses       1771     1787      +16     
  Partials        1        1              

see 10 files with indirect coverage changes

[pi0]

(put on draft to work on some refactors before officially adding the session page)