Move `@daffodil/theme-switch` into `@daffodil/storefront`

### Feature description

Move `@daffodil/theme-switch` into `@daffodil/storefront`

The theme switch component doesn't need to be its own package. It should be moved into `@daffodil/storefront` as part of its components. (`@daffodil/storefront/theme-toggle`?)

### Use case

_No response_

### Prior work

_No response_

### Daffodil version

0.91.0

### Additional context

_No response_