[ImgBot] Optimize images

*Total -- 7,033.12kb -> 4,568.73kb (35.04%)

/documentation/images/demo2.png -- 8.48kb -> 4.26kb (49.74%)
/documentation/images/demo21.png -- 183.96kb -> 96.95kb (47.29%)
/documentation/images/demo23.png -- 216.47kb -> 115.31kb (46.73%)
/documentation/images/demo17.png -- 196.05kb -> 107.63kb (45.1%)
/documentation/images/demo18.png -- 196.04kb -> 108.79kb (44.51%)
/documentation/images/demo25.png -- 752.57kb -> 423.62kb (43.71%)
/documentation/images/demo22.png -- 737.86kb -> 415.53kb (43.68%)
/documentation/images/demo10.png -- 306.88kb -> 178.85kb (41.72%)
/documentation/images/demo0.png -- 724.22kb -> 430.19kb (40.6%)
/documentation/images/demo12.png -- 79.43kb -> 48.76kb (38.61%)
/documentation/images/demo19.png -- 58.29kb -> 37.58kb (35.53%)
/documentation/images/demo27.png -- 172.27kb -> 112.55kb (34.67%)
/documentation/images/demo28.png -- 173.20kb -> 113.38kb (34.54%)
/documentation/images/demo26.png -- 245.05kb -> 162.52kb (33.68%)
/documentation/images/system-overview-kubernetes-v1.png -- 298.09kb -> 200.98kb (32.58%)
/documentation/images/demo8.png -- 97.94kb -> 66.15kb (32.45%)
/documentation/images/demo13.png -- 138.80kb -> 95.53kb (31.18%)
/documentation/ci-automation-kubernetes-v1.png -- 251.11kb -> 172.87kb (31.16%)
/documentation/images/ci-automation-kubernetes-v1.png -- 251.11kb -> 172.87kb (31.16%)
/documentation/images/demo5.png -- 159.50kb -> 111.58kb (30.04%)
/documentation/images/demo20.png -- 128.58kb -> 90.02kb (29.98%)
/documentation/images/demo16.png -- 60.31kb -> 42.47kb (29.58%)
/documentation/images/demo4.png -- 195.40kb -> 141.77kb (27.44%)
/documentation/images/demo14.png -- 96.10kb -> 69.89kb (27.27%)
/documentation/images/demo9.png -- 96.63kb -> 70.60kb (26.94%)
/documentation/images/demo24.png -- 151.64kb -> 112.04kb (26.11%)
/documentation/images/demo7.png -- 81.56kb -> 61.51kb (24.58%)
/documentation/images/demo1.png -- 253.62kb -> 195.96kb (22.74%)
/documentation/images/demo15.png -- 53.59kb -> 41.68kb (22.23%)
/documentation/images/demo3.png -- 394.03kb -> 320.15kb (18.75%)
/documentation/images/demo6.png -- 64.33kb -> 54.41kb (15.42%)
/documentation/images/A-Icon.png -- 3.48kb -> 3.11kb (10.64%)
/documentation/images/demo11.png -- 202.93kb -> 185.80kb (8.44%)
/documentation/images/D-Icon.png -- 3.62kb -> 3.42kb (5.34%)

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

Author: ImgBotApp