fix(docs): navbar examples

[tianenpang]

Closes #1240

📝 Description

• Avatar rendered as a button.
• Remove NavbarItem to get cleaner dom.
• NavbarContent rendered as a div since its child are not list items.

💣 Is this a breaking change (Yes/No):

No.

📝 Additional Information

• Sync example and code for controlled menu section.
• Update navbar's stories.

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Latest commit: 1317463

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Name	Status	Preview	Comments	Updated (UTC)
nextui-storybook-v1	❌ Failed (Inspect)			Aug 4, 2023 5:38pm

[jrgarciadev]

Thank you, well done! @tianenpang 🚀