[ImgBot] Optimize images

*Total -- 6,791.98kb -> 3,275.88kb (51.77%)

/assets/newlines.gif -- 100.34kb -> 6.63kb (93.39%)
/assets/vi_support.gif -- 685.20kb -> 134.60kb (80.36%)
/assets/spinner.gif -- 267.20kb -> 60.63kb (77.31%)
/assets/cmdbar.gif -- 278.36kb -> 121.63kb (56.31%)
/assets/screenshots/s02-revert.png -- 944.00kb -> 420.81kb (55.42%)
/assets/binary_diff.png -- 63.88kb -> 31.17kb (51.2%)
/assets/screenshots/s03-commit.png -- 1,001.72kb -> 491.67kb (50.92%)
/assets/screenshots/s00-diff.png -- 1,034.90kb -> 510.97kb (50.63%)
/assets/light-theme.png -- 756.01kb -> 417.72kb (44.75%)
/assets/screenshots/s01-log.png -- 1,571.65kb -> 999.73kb (36.39%)
/assets/logo.png -- 25.07kb -> 18.21kb (27.36%)
/assets/perf_compare.jpg -- 63.63kb -> 62.10kb (2.4%)

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

Author: ImgBotApp