Add sections to sidebar

[BrendanChou]

First step in documentation overhaul by type of user

Also:

• Combine Introduction and About sections
• Simplify Security and Terms & Policies folders
• Remove V3 Documentation as a Banner

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Name	Status	Preview	Comments	Updated (UTC)
v4-teacher	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 23, 2024 8:32pm