[Dune] Update of the official Homepage / dunedesign.png

[Christoph Grüninger]

Dear Dune image designers,
including my step-like proposal with the nice ideas from Jö and Markus, 
adding a new idea to reuse the \dots and a T-shaped element lead to the 
attached version.

I'm against voting on the proposals. I'm more the consensus guy so I'd 
cherry-pick the nicest parts from all proposals.

Christoph
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