Replace backticks with double JSON.stringify().

[chmac]

This fixes #69

Newlines don't get properly encoded. The result of JSON.stringify() is a string, but to embed that string inside an HTML page, it needs to be encoded a second time. Then the \n newlines get converted to \\n so that the \ is preserved.

In my testing this works.

Description

Test plan

Possible regressions or performance implications

Dependencies

Reviewer checklist

• Code is well-designed and only as complicated as necessary.
• Good experience for clients of code.
• Existing use-cases are implemented, not potential future ones (YAGNI).
• Clear and consistent naming.
• Comments and documentation are clear, useful, and explain why instead of what.
• Sensible and attractive UI changes, if any.

[vercel]

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