Shorten overview "big picture"#479

frank-at-adacore wants to merge 5 commits intomasterAdaCore/training_material:masterfrom

slides/123-refine-the-overview-intro-module-by-removing-recap-slidesAdaCore/training_material:slides/123-refine-the-overview-intro-module-by-removing-recap-slidesCopy head branch name to clipboard