[ImgBot] Optimize images

*Total -- 833.67kb -> 676.96kb (18.8%)

/documentation/images/issue-08.png -- 60.81kb -> 21.94kb (63.92%)
/documentation/images/techzone-06.png -- 50.43kb -> 35.30kb (30%)
/documentation/images/techzone-00.png -- 40.61kb -> 32.42kb (20.17%)
/documentation/images/techzone-01.png -- 123.55kb -> 99.17kb (19.73%)
/documentation/images/techzone-03.png -- 131.54kb -> 107.53kb (18.25%)
/documentation/images/techzone-07.png -- 79.44kb -> 66.20kb (16.66%)
/documentation/images/techzone-04.png -- 79.44kb -> 66.20kb (16.66%)
/documentation/images/techzone-02.png -- 117.05kb -> 100.93kb (13.78%)
/documentation/images/techzone-05.png -- 150.81kb -> 147.26kb (2.35%)

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

Author: ImgBotApp