[v2] Fails to build if markdown image alt-text has double quotes

[garrettjstevens]

🐛 Bug Report

If the alt-text for an image in a markdown file has double quotes, docusaurus will not build.

Have you read the Contributing Guidelines on issues?

Yes

To Reproduce

1. Create docusaurus page with classic template
2. To any markdown file, add an image with double quotes in the alt text, like this:
   ![alt text with "quotes"!](../static/img/logo.svg)

Expected behavior

The page builds.

Actual Behavior

The site will not build. The error looks like:

./docs/doc1.md
SyntaxError: /sandbox/docs/doc1.md: Unexpected token, expected "}" (65:57)

> 65 | <p>{`Has quotes in alt text: `}<img alt={"alt text with "quotes"!"} src={require("!url-loader?limit=10000&name=assets/images/[name]-[hash].[ext]&fallback=file-loader!./../static/img/logo.svg").default}  /></p>
     |                                                          ^

It looks to me like the double quotes are not getting escaped.

Your Environment

• Docusaurus version used: 2.0.0-alpha.66
• Environment name and version: Chrome 86.0.4240.198, Node.js 10.21.0
• Operating system and version: Linux Mint

Reproducible Demo

Reproducible codesandbox: https://codesandbox.io/s/suspicious-brattain-1g5k4?file=/docs/doc1.md:2219-2294

[slorber]

Thanks, you are right, our remark plugins should escape those quotes properly