[ImgBot] Optimize images (#1463)

*Total -- 476.82kb -> 271.59kb (43.04%)

/doc/development/LedDevice_Flows.png -- 411.85kb -> 213.78kb (48.09%)
/resources/icons/restart.svg -- 0.60kb -> 0.47kb (22.17%)
/cmake/osxbundle/Background.png -- 64.36kb -> 57.34kb (10.92%)

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Co-authored-by: ImgBotApp <ImgBotHelp@gmail.com>

Author: imgbot[bot]