[ImgBot] Optimize images

*Total -- 100.12kb -> 63.81kb (36.26%)

/.gitbook/assets/SetBirthdayForAnotherPerson.png -- 36.63kb -> 23.17kb (36.75%)
/.gitbook/assets/RegisterWentWrong.png -- 63.48kb -> 40.64kb (35.98%)

Signed-off-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: ImgBotApp