docs: add hero image

[pboth1304]

Pascal Bothner pascal.bothner@mercedes-benz.com
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[pboth1304]

You can check out how the hero image looks in the docs here: https://covesa.github.io/ifex-viewer/

[gunnar-mb]

Hi Pascal. I'm OK with the image on the IFEX Viewer and I also like our themes on the examples and unit test files and such. But here on the IFEX project, having the Imperial fleet thing immediately on the first image looks odd to me - would prefer an example people see something they can relate to in their professional work. The idea is to understand what the project actually does on the first glance, right? So that's why I haven't merged.

[gunnar-mb]

And even, overlaying any text on the logo kind of changes the logo?
Actually, I think it makes sense on the viewer because its purpose is to view the interfaces, but maybe not here. It is a way to visually make a difference between the projects too.