[ImgBot] Optimize images (#8678)

*Total -- 4,480.09kb -> 4,127.75kb (7.86%)

/sickchill/gui/slick/css/fonts/Semibold/OpenSans-Semibold.svg -- 1,139.47kb -> 856.53kb (24.83%)
/sickchill/gui/slick/css/fonts/Light/OpenSans-Light.svg -- 258.16kb -> 252.11kb (2.35%)
/sickchill/gui/slick/css/fonts/Bold/OpenSans-Bold.svg -- 264.11kb -> 258.04kb (2.3%)
/sickchill/gui/slick/css/fonts/Regular/OpenSans-Regular.svg -- 266.09kb -> 260.03kb (2.28%)
/sickchill/gui/slick/fonts/glyphicons-halflings-regular.svg -- 106.19kb -> 103.92kb (2.14%)
/sickchill/gui/slick/css/fonts/ExtraBoldItalic/OpenSans-ExtraBoldItalic.svg -- 283.40kb -> 277.34kb (2.14%)
/sickchill/gui/slick/css/fonts/BoldItalic/OpenSans-BoldItalic.svg -- 284.26kb -> 278.21kb (2.13%)
/sickchill/gui/slick/css/fonts/SemiboldItalic/OpenSans-SemiboldItalic.svg -- 289.45kb -> 283.39kb (2.09%)
/sickchill/gui/slick/css/fonts/Italic/OpenSans-Italic.svg -- 290.77kb -> 284.70kb (2.09%)
/sickchill/gui/slick/css/fonts/LightItalic/OpenSans-LightItalic.svg -- 291.13kb -> 285.07kb (2.08%)
/sickchill/gui/slick/fonts/fontawesome-webfont.svg -- 433.96kb -> 425.36kb (1.98%)
/sickchill/gui/slick/fonts/forkawesome-webfont.svg -- 547.41kb -> 537.77kb (1.76%)
/sickchill/gui/slick/images/Gotify.png -- 25.68kb -> 25.30kb (1.48%)

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