chore: change mermaid from cdn to npm

[YangFong]

• 将 mermaid 用法从 cdn 改为 npm
• 修复首次渲染时，多个 mermaid 可能产生的错误

[github-actions]

🎊 PR Preview has been successfully built and deployed to https://doocs-md-preview-pr-357.surge.sh

[YangFong]

测试数据：

# 图表测试


```mermaid
pie
 title Key elements in Product X
 "Calcium" : 42.96
 "Potassium" : 50.05
 "Magnesium" : 10.01
 "Iron" : 5
```

```mermaid
classDiagram
Class01 <|-- AveryLongClass : Cool
Class03 *-- Class04
Class05 o-- Class06
Class07 .. Class08
Class09 --> C2 : Where am i?
Class09 --* C3
Class09 --|> Class07
Class07 : equals()
Class07 : Object[] elementData
Class01 : size()
Class01 : int chimp
Class01 : int gorilla
Class08 <--> C2: Cool label
```


```mermaid
pie
 title Key elements in Product X
 "Calcium" : 42.96
 "Potassium" : 50.05
 "Magnesium" : 10.01
 "Iron" : 5
```


```mermaid
pie
 title 为什么总是宅在家里？
 "喜欢宅" : 45
 "天气太热" : 70
 "穷" : 500
 "关你屁事" : 95
```

```mermaid
pie
 title 为什么总是宅在家里？
 "喜欢宅" : 45
 "天气太热" : 70
 "穷" : 500
 "关你屁事" : 95
```


```mermaid
pie
 title 为什么总是宅在家里？
 "喜欢宅" : 45
 "天气太热" : 70
 "穷" : 500
 "关你屁事" : 95
```

```mermaid
pie
 title 为什么总是宅在家里？
 "喜欢宅" : 45
 "天气太热" : 70
 "穷" : 500
 "关你屁事" : 91
```

```mermaid
pie
 title 为什么总是宅在家里？
 "喜欢宅" : 45
 "天气太热" : 70
 "穷" : 500
 "关你屁事" : 9
```


```mermaid
pie
 title 为什么总是宅在家里？
 "喜欢宅" : 45
 "天气太热" : 70
 "穷" : 500
 "关你屁事" : 95
```