[ImgBot] Optimize images

*Total -- 74.50kb -> 62.90kb (15.57%)

/src/frontend/app-images/favicons/android-chrome-512x512.png -- 34.27kb -> 26.74kb (21.97%)
/src/frontend/app-images/favicons/mstile-150x150.png -- 10.13kb -> 8.93kb (11.78%)
/src/frontend/app-images/favicons/apple-touch-icon.png -- 11.07kb -> 9.90kb (10.57%)
/src/frontend/app-images/favicons/android-chrome-192x192.png -- 15.27kb -> 13.73kb (10.07%)
/src/frontend/app-images/favicons/favicon-32x32.png -- 1.95kb -> 1.83kb (6.07%)
/src/frontend/app-images/favicons/safari-pinned-tab.svg -- 1.81kb -> 1.76kb (2.8%)

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

Author: ImgBotApp