BUG: Whiteboard preview image not sharp

[SimoneZaza]

Describe the bug The preview image of the whiteboard looks a bit blurry. Would be nice if this could be sharper.

To Reproduce Steps to reproduce the behavior:

1. Go to https://alkem.io/welcome-space/knowledge-base
2. Click on '....'
3. Scroll down to the whiteboard
4. See error

Expected behavior A sharp image, maybe export at 2-3x?

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.