Don't show markdown code in events list

[SimoneZaza]

Description

As a non-technical user, I get confused when I see markdown code on the dashboard in a space. When the description field of an event starts with an image, the markdown code for this image is shown in the events list block on the space dashboard:

On the events dialog itself, a small part of the image is shown which is fine:

Acceptance criteria

• [ ] Do not show markdown code in the events list on the space dashboard
• [ ] Instead,
• preferably show an image icon like this: 🖼️
• or show a small part of the image, like it is done in the events dialog

Areas that will be affected

To be added during the refinement