HMR port being used for preview "Upgrade Required"

Right now when you initialize this template, the browser preview defaults to the HMR port (8002) instead of the web server (3000).

```js
// Incorrect (HMR port)
"https://[id]-8002.preview.csb.app"
// Correct (web server port)
"https://[id]-3000.preview.csb.app"
```

Using port 8002 will cause the page to say:

> Upgrade Required