Migrate remaining demos to docs

[carbonrobot]

Migrate the remaining demos to docs website.

• New Accessibility Guide
• Add Advanced Brushing example
• Add Axis - Brush Lines example
• Pretty format Axis - Parallel Brush example
• Remove duplicate brush-zoom example
• Remove all demos, demo now only contains theme builder POC

[changeset-bot]

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Latest commit: 7124cb0

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[ramenhog]

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