feat(postcss): export CSS Modules as ES Modules
feat(postcss): export CSS Modules as ES Modules

The CommonJS-syntax for CSS Module exports got replaced by the
ESM-syntax. If you're currently using the CommonJS-syntax, you can adapt
in two ways:

**1.) Taking the `default`-export into account**

```diff
- const styles = require('./module.css');
+ const { default: styles } = require('./module.css');
```

**2.) Switching to ESM**

```diff
- const styles = require('./module.css');
+ import styles from './module.css';
```

BREAKING CHANGE: CSS Modules switched to ESM and now export the styles
object as a `default`-export.

xing/hops,xing/hops,xing/hops