Update internet-header breadcrumb web-component

[oliverschuerch]

https://www.figma.com/file/xZ0IW0MJO0vnFicmrHiKaY/Components-Post?type=design&node-id=154-0&mode=design&t=KcGXo3HbBpJRhkuC-0

Tasks

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1. Check and/or update basic styles
2. Add responsive sizing behaviour (mobile/desktop)
3. Check if we need to change the flex behaviour on small screens to get around the error showed in the image below
4. Update docs

[gfellerph]

@oliverschuerch check with @rouvenpost how the breadcrumb items should collapse and if the buttons can wrap to a new line.

[oliverschuerch]

Decition:

• Collapse on all device sizes if space is insufficent. Collapse all but last or none.
• Wrap help- and contact-buttons to next line (align them to the right) if space for breadcrumb is insufficent.

[gfellerph]

Closing in favor of #3277 (new implementation)