docs(v3 migration): update migration guide

[al1maher]

• 📖 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

Updated the v3 migration guide regarding the changes of Accordion, Table components.

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

[al1maher]

Of course I'd prefer to gather all the changes in one PR, but it's hard to mind about all the changes at once, and I'm still discovering them along the way, as in my company, we recently migrated from v2 to v3.

[benjamincanac]

No worries, thank you for doing this work I did miss a lot of them when I released v3 after working on it for a year 😬 We can keep this one open until you're done migrating 😊

[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@5702

commit: bf5f6a7

[al1maher]

I think that'll do. I'll keep it updated until we fully migrate and test it.