Remove margin from ContentNotification

[dferber90]

Our ui-kit components shouldn't define their own margins. The spacing should always be defined by the parent. We therefore remove the margin defined on ContentNotification.

Consumers can use Spacings.Inset to wrap ContentNotification instead. Use scale="m" to keep the same spacing as originally defined on ContentNotification.

<Spacings.Inset scale="m">
  <ContentNotification>Hello there</ContentNotification>
</Spacings.Inset>

[emmenko]

Thanks!! 🙏

[tdeekens]

UI-Kit elements themselves should not have spacings applied the outside.