Refactor folders of images for JavaDoc

[hendrikebbers]

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:space_invader: Description of the issue

See @aalmiray comment here: https://github.com/canoo/dolphin-platform/pull/813

In the JavaDoc for several classes we add images to provide a better understanding of the architecture and workflows. When we refactored the packages of the classes we missed to refactor the folders that contains the images.

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[ptella]

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