markdown语法支持建议

[selfancy]

Is your feature request related to a problem?

1. 当前不支持二级引用

2. 当前不支持表格

3. 当前不支持mermaid语法，流程图等

4. 当前不支持markdown编写预览

希望以上可以支持下😘

1. 二级引用效果

一级引用

二级引用

2. 表格效果

First Header	Second Header	Third Header
Content Cell	Content Cell	Content Cell
Content Cell	Content Cell	Content Cell

3. mermaid流程图效果

sequenceDiagram
participant Alice as A
participant Bob as B
Alice->John: Hello John, how are you?
John-->Alice: Great!
John->Bob: How about you?
Bob-->John: Jolly good!

Additional context

No response

[Issues-translate-bot]

Issue is not in English. It has been translated automatically.

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Title: markdown syntax support suggestion

[Zeng1998]

Do you really need to input these complex things ?

[selfancy]

@Zeng1998 The table is very useful

[ocean-sudo]

Maybe KaTeX can be added as well?