Upgraded docus

[NyllRE]

🔗 Linked issue

#730

❓ 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

I've updated the main docus theme from @nuxt-themes/docus to the modern docus implementation and updated the pinia declaration.

Warning

On development there is a page not found error that doesn't affect the production build.

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[NyllRE]

I assume this is how the app is supposed to look like as opposed to this.