Check and replace the images on the landing page

Check if the images (especially for the entries "Data Integration", "The Way We Work", and " The Team") can be replaced by better images.

changed milestone to %Website Release

assigned to @loewenzahm and @rinkk

Images for DI & TWWW have been removed and the image for 'Team' was replaced with the small team gallery in Commit 0c8e7a5c

closed