Document: Add some advanced chunks recipes

Add some advanced chunks recipes that we can generally recommend so that users can start with them.

For example:
```js
const advancedChunks = {
  groups: [
    { name: 'vendor', test: /\/node_modules\//, minSize: 4096, maxSize: 1000 * 1000 },
    { name: 'shared', minSize: 4096, maxSize: 1000 * 1000, minShareCount: 2 },
  ]
}
```
(Not sure if this can be recommended generally)
