[ImgBot] Optimize images

*Total -- 16,619.12kb -> 14,745.87kb (11.27%)

/.github/assets/one.png -- 1,231.00kb -> 967.69kb (21.39%)
/.github/assets/six.png -- 1,259.14kb -> 998.04kb (20.74%)
/.github/assets/two.png -- 1,277.14kb -> 1,060.65kb (16.95%)
/.github/assets/five.png -- 3,937.24kb -> 3,468.97kb (11.89%)
/.github/assets/three.png -- 1,421.77kb -> 1,256.28kb (11.64%)
/.github/assets/four.png -- 2,577.66kb -> 2,362.79kb (8.34%)
/.github/assets/IMG_20211014_084106.jpg -- 856.79kb -> 789.28kb (7.88%)
/.github/assets/IMG_20211014_084124.jpg -- 508.59kb -> 472.44kb (7.11%)
/.github/assets/desktop.jpg -- 667.23kb -> 622.29kb (6.73%)
/.github/assets/IMG_20211014_084143.jpg -- 531.63kb -> 496.02kb (6.7%)
/.github/assets/app_showcase.jpg -- 1,172.48kb -> 1,097.69kb (6.38%)
/.github/assets/edited_showcase.png -- 694.08kb -> 675.00kb (2.75%)
/.github/assets/banner.jpg -- 178.15kb -> 175.49kb (1.49%)
/.github/assets/udroid_logo.png -- 306.22kb -> 303.24kb (0.97%)

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

Author: ImgBotApp