docs(nextjs): add nextjs install pkg for @nextui-org/theme

[vadxq]

Closes #2302

📝 Description

Improve nextjs installation guide, add installation @nextui-org/theme prompt

⛳️ Current behavior (updates)

can not import theme style

🚀 New behavior

Add and install the theme package and introduce style

💣 Is this a breaking change (Yes/No):

No

📝 Additional Information

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: ea2e98fe01ed83a028a0ffdee30fe40ba251c5c3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[wingkwong]

You don't need to install @nextui-org/theme if you install @nextui-org/react. You only need to do that for Individual Installation which already covered in the current doc.