[Baize] 文档结构有些混乱，新手教程和使用说明混在一起，应该优化

[samzong]

Describe the bug

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To Reproduce

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1. Go to '...'
2. Click on '...'
3. Scroll down to '...'
4. See error

Expected behavior

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Screenshots

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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context

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