[ImgBot] Optimize images

*Total -- 836.94kb -> 629.72kb (24.76%)

/screenshots/dashboard-transfers.png -- 200.19kb -> 140.51kb (29.81%)
/screenshots/dashboard-detail.png -- 185.40kb -> 130.25kb (29.74%)
/screenshots/dashboard-form.png -- 154.78kb -> 112.43kb (27.36%)
/screenshots/dashboard-accounts.png -- 177.95kb -> 129.68kb (27.13%)
/screenshots/dashboard-form.thumb.png -- 23.86kb -> 23.42kb (1.82%)
/screenshots/dashboard-accounts.thumb.png -- 29.57kb -> 29.13kb (1.51%)
/screenshots/dashboard-transfers.thumb.png -- 34.99kb -> 34.48kb (1.46%)
/screenshots/dashboard-detail.thumb.png -- 30.20kb -> 29.82kb (1.25%)

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

Author: ImgBotApp