[ImgBot] Optimize images

*Total -- 708.82kb -> 580.51kb (18.1%) /images/pg_credentials.png -- 50.10kb -> 23.67kb (52.76%) /images/kube_ui_gr.png -- 91.53kb -> 58.16kb (36.46%) /images/gitlab_container_2.png -- 271.47kb -> 220.58kb (18.75%) /images/new_project.png -- 61.31kb -> 54.46kb (11.17%) /images/first_commit.png -- 28.17kb -> 25.15kb (10.72%) /images/gitlab_first_run.png -- 50.09kb -> 45.57kb (9.02%) /images/system.png -- 24.55kb -> 22.38kb (8.82%) /images/dashboard.png -- 96.97kb -> 95.93kb (1.08%) /images/gitlab-passwd.png -- 34.62kb -> 34.61kb (0.03%)

Author: ImgBotApp