ci: 👷 improve SDS universum pages

[coraliefeil]

User Story

As a maintainer of the Solid Design System, I would like to present the SDS on Universum in the best way possible, so that the assets and templates look appealing and are easy to scan.

Suggested Solution

• Provide assets
• Draft out design proposal for templates
• Remove emojis (should not be used)

Figma File

DoR

• Item has business value
• Item has been estimated by the team
• Item is clear and well-defined
• Item dependencies have been identified

DoD

• Documentation has been created/updated (if applicable)
• Implementation works successfully on feature branch

[coraliefeil]

@karlbaumhauer and I had a session and identified some small design tasks to execute whenever there is some gap time.