… if already exists)

…where

Also, previously used production builds do not exist until `npm run build`
is run for the first time.

…h GitHub and Bitbucket

…entation

Developers want to handle this themselves. Let us not be overly opinionated.

…ring keyboard navigation #499

Use the `clip` value for `overflow` to prevent the content from unwanted
scrolling on the cross axis during keyboard navigation.

…sing the transferProps principle

Update src/components/_helpers/transferProps.js

Co-authored-by: Adam Kudrna <adam@adamkudrna.cz>

Update src/components/_helpers/transferProps.js

Co-authored-by: Adam Kudrna <adam@adamkudrna.cz>

Update src/components/_helpers/transferProps.js

Co-authored-by: Adam Kudrna <adam@adamkudrna.cz>

`css-loader` now only treats `*.module.*` files as CSS Modules.

As long as `layers.scss` (layers order definition) is called first, our Sass
styles can be imported in any order.

It solves the incorrect (but unavoidable, due to the way we compile CSS) call
order of styles in our `index.js`.

Also, developers can now extend the CSS cascade instead of just prepending or
appending their styles to ours.

For example:

```css
/* My custom app styles */
@layer foundation.elements {
  code {
    background-color: silver;
  }
}
```