[Bug]: Headings not support HTML character entities or escape characers

[recallwei]

Version

System:
    OS: macOS 14.0
    CPU: (10) arm64 Apple M2 Pro
    Memory: 79.34 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Chrome: 118.0.5993.117
    Safari: 17.0
  npmPackages:
    rspress: ^1.5.0 => 1.5.0

Details

Headings and TOC does not support HTML character entities and escape characters.

What I expect to be:

User('sub')

---

But got:

---

Reproduce link

https://codesandbox.io/p/sandbox/awesome-sunset-fmx92l?file=%2Fdocs%2Foverview%2Findex.md%3A9%2C1

Reproduce Steps

```md
# 概览

## @User(\'abc\')

\'  
'

## @User('abc')
```

[10Derozan]

You can unable this config to avoid this error.
I'll fix it at web-infra-dev/mdx-rs#14