[BUG] center title

[BrentHuang]

Describe the bug
A clear and concise description of what the bug is.

### 三级标题居中示例 {#三级标题居中示例 data-source-line="151"}

Environment

• OS: Windows 10
• VSCode: 1.89.1
• Markdown Preview Enhanced: 0.8.1

To Reproduce
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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三级标题居中示例

Markdown file
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a.md

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Additional context
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[BrentHuang]

<center>**加粗的文字，并且水平居中**</center>
<center><u>加下划线的文字，并且水平居中</u></center>
<center>==标记的文字，并且水平居中==</center>

[Yue-Zhengyuan]

You can center align the title by changing the CSS. Add the following lines to your style.less file:

h1, h2, h3, h4, h5, h6 {
    text-align: center;
}

Don't use the HTML <center> tag.