Alternative playground idea

まだ誰も着手していません。

_First of all, thank you for creating such a comprehensive resource and making it freely available! As I often get asked about where to start learning JS, this is constantly in my top 3-4 aswers :)_

I wonder, are you open to adding an alternative playground option if it would provide an improved experience for your users?

I'm thinking specifically about StackBlitz, some of the benefits being:
- no ads
- familiar editor UI, that a lot of people know from Visual Studio Code
- support for dark/light themes
- a possibility to render a Console right in the UI, which could optionally allow replacing `alert` with `console.log` for a non-blocking flow
- a possibility to add Node.js articles in the future, since StackBlitz supports it too (see e.g. https://node.new)

I've made a quick proof of concept of how the experience could look like:


Thanks again, and I'm curious to hear your thoughts!

まず issue 本文と、そこからリンクされている StackBlitz の proof of concept を確認してください。代替の playground をチュートリアルに統合すべきかを評価し、影響を受ける記事、ユーザーエクスペリエンス、受け入れ基準を定義してください。この issue では、ファイル、テスト、または具体的な Definition of Done は特定されていません。

索引モデルが issue の本文から書いたものです。