fix(integrations): Improper code sanitization

[ptrgits]

fix the problem, we need to ensure that any potentially dangerous characters in the stringified headings are properly escaped before embedding them in the generated JavaScript code. The best way to do this is to escape characters such as <, >, /, \, and certain Unicode line/paragraph separators, as well as control characters, in the output of JSON.stringify(headings). This can be achieved by defining an escapeUnsafeChars function (as in the example) and applying it to the stringified headings before constructing the export statement. The change should be made in packages/integrations/mdx/src/rehype-collect-headings.ts, specifically on line 8, and the function should be defined in the same file or imported if already available.

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[ematipico]

Thank you @ptrgits for the PR. Here's a few things to address for your first contribution:

• please restore the template provided by the PR and fill all the relevant sections
• please tell us if this PR fixes an existing issue or not
• please add some tests that show the PR fixed some cases
• please add a changeset