As the title mentions, HTML template references alpha https://pyscript.net/alpha/pyscript.js.

Ideally, the create cmd should be able to hit an API or something so that it can dynamically determine what's the latest release and pin/use that.

Since we don't have an API right now, the scope of this issue is to pin the latest version statically as default value and add a new create cmd argument called pyscript-version that allows users to specify a different version instead of the default