docs: Section about recommended directory structure

[spydon]

Description

Since many people stumble upon dependency conflicts due to that they have an app in the root of the workspace this PR adds a section to the docs suggesting a recommended directory structure.

Type of Change

• [ ] ✨ feat -- New feature (non-breaking change which adds functionality)
• [ ] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [x] 📝 docs -- Documentation
• [ ] 🗑️ chore -- Chore

[docs-page[bot]]

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