Deprecation of the VS Code Extension

Please note that this extension has been deprecated in favor of the [WebNative.dev](https://marketplace.visualstudio.com/items?itemName=WebNative.webnative) extension and is no longer maintained. If you are experiencing issues with this extension please consider switching to the [WebNative.dev](https://marketplace.visualstudio.com/items?itemName=WebNative.webnative) extension.

The issue only announces that this extension is deprecated and directs users to the WebNative.dev extension. It names no repository files, tests, or implementation entry points, and provides no remaining change to make. Confirm the deprecation notice and linked replacement before taking any action.

索引モデルが issue の本文から書いたものです。