fix: sanitize highlighted text

[danielroe]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Previously we were producing code like this:

<span class=\"ct-2c497b\"><</span>

which breaks the dom tree - or worse, renders the highlighted code directly as HTML elements.

Looking through the codebase it seems likely that this fix might need to be applied elsewhere too and it would be worth a quick look.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[farnabaz]

Thanks 👍