[ImgBot] Optimize images

*Total -- 165.41kb -> 108.22kb (34.57%)

/.gitbook/assets/grafik.png -- 31.72kb -> 18.66kb (41.17%)
/.gitbook/assets/SetBirthdayForAnotherPerson.png -- 36.63kb -> 23.17kb (36.75%)
/.gitbook/assets/RegisterWentWrong.png -- 63.48kb -> 40.64kb (35.98%)
/.gitbook/assets/grafik (4).png -- 22.89kb -> 16.03kb (29.97%)
/.gitbook/assets/grafik (2) (1).png -- 10.68kb -> 9.72kb (8.96%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp