rewrote some sections and enabled auto select

Summary:
update outdated images

Rework image cropper documentation and replaced outdated images as well
as inserted auto select

Fixes T27098

Test Plan: f1 or webpage

Reviewers: O3 MITK Reviewer Group II, kalali

Reviewed By: O3 MITK Reviewer Group II, kalali

Subscribers: floca, kompan, kalali

Maniphest Tasks: T27098

Differential Revision: https://phabricator.mitk.org/D375