[ImgBot] Optimize images

*Total -- 1,301.32kb -> 995.44kb (23.51%)

/images/css-reference-type.png -- 21.79kb -> 11.66kb (46.48%)
/images/css-reference-share.png -- 137.58kb -> 74.45kb (45.89%)
/images/css-reference-icon.png -- 8.06kb -> 4.65kb (42.24%)
/images/html-reference-logo.png -- 38.77kb -> 24.51kb (36.77%)
/images/css-reference-logo.png -- 32.66kb -> 20.76kb (36.45%)
/images/bulma-logo.png -- 10.91kb -> 7.16kb (34.37%)
/favicons/android-chrome-384x384.png -- 9.73kb -> 7.23kb (25.72%)
/images/landscape.png -- 982.67kb -> 790.64kb (19.54%)
/favicons/apple-touch-icon.png -- 5.97kb -> 4.85kb (18.69%)
/favicons/mstile-150x150.png -- 3.65kb -> 3.01kb (17.49%)
/favicons/android-chrome-192x192.png -- 9.27kb -> 8.18kb (11.77%)
/images/fortyfour-background.jpg -- 14.49kb -> 13.16kb (9.17%)
/images/jt.png -- 8.49kb -> 8.07kb (4.98%)
/favicons/safari-pinned-tab.svg -- 17.28kb -> 17.10kb (1.07%)

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

Author: ImgBotApp