docs(napi): simplify + reformat README

[overlookmotel]

In particular:

• the long comment was scrolling off side of screen on npm.com.
• the example is ESM, so can simplify it by using top level await.

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[overlookmotel]

• docs(napi): Remove JSON.parse from example #6836
• docs(napi): simplify + reformat README #6834 👈
• main

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