doc: update README to make Node.js description clearer
Fixes: https://github.com/nodejs/node/issues/24872
This PR updates the README's original description:
Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine.
To:
Node.js is an open-source, cross-platform, JavaScript runtime environment. It executes JavaScript code outside of a browser
Based on the two sentence suggestion from the issue discussion.
Checklist
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documentation is changed or added -
commit message follows commit guidelines