fix(docs): 优化官网文档并解决过程中发现的问题

[DymoneLewis]

1. 优化快速上手文档的内容
2. 新增 背景、网格、主题、渐进连线 和 基础边 的demo
3. 新增 类型定义字典

[changeset-bot]

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Latest commit: 67e20c9

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[boyongjiong]

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