Link to DB UX Design System is outdated

[RiZKiT]

See

db-ui.github.io/db-ux-design-system.html

Line 43 in 579d4a9

href="https://marketingportal.extranet.deutschebahn.com/marketingportal"

[mfranzke]

@RiZKiT thanks a lot for your feedback. We're currently planning to update this landing page anyhow, and I will follow up with this one.