docs(tasks): use `server/` dir

[geromegrignon]

🔗 Linked issue

❓ Type of change

• [x] 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• [ ] 🐞 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

The current Tasks documentation includes a specific Nuxt note requiring the tasks folder to be in the server one (https://nitro.unjs.io/guide/tasks#define-tasks). However, it's also required for a standalone Nitro application in its current state, making this note outdated and needing to update all path mentions to include server.

📝 Checklist

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

[geromegrignon]

@pi0 I will add new commits to update the whole documentation.

[pi0]

Thanks dear @geromegrignon it would be of great help for docs consistency! Would you like me to wait to push on same PR?

[geromegrignon]

@pi0 sure, I converted it to draft meanwhile.

[alexcroox]

I lost a fair amount of time today following the docs and putting tasks in the root rather than in server/. Could this PR be merged soon to avoid tripping up others? Thanks

[geromegrignon]

Hi @alexcroox, i'll resolve conflicts today and tag the PR as ready for review today

[geromegrignon]

Done: ready for review

[franklin-tina]

Thanks @geromegrignon 🫶