Do not promote docker alpine image in the website

The Alpine Docker image for Node.js is experimental, as Node.js does not fully support MUSL (though it works reasonably well there). We should stop promoting this. <img width="1125" height="541" alt="Image" src="https://github.com/user-attachments/assets/63a476d0-d2a4-4ebc-8d8e-61fb77b534d2" />