docs(getting-started): add transitions page

[Krutie]

🔗 Linked issue nuxt/nuxt#13653

❓ 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

Added getting-started guide for page and layout transitions

📝 Checklist

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

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[atinux]

Thank you for the PR @Krutie ❤️

I am wondering if transitions should be part of Getting started (trying to give the basics), though it is a really nice feature of Nuxt to provide this.

Happy to get feedback from other team members and community!

[clemcode]

Thanks @Krutie , this is a very good addition! @atinux I think that for now, the Getting Started section is the best place for this page, though we might split the most advanced parts when we'll start working on the examples sections with real use-cases.

[clemcode]

Minor Tweaks