[ImgBot] Optimize images

*Total -- 247.17kb -> 229.98kb (6.95%)

/static/img/tutorials.png -- 4.20kb -> 3.02kb (28.01%)
/static/img/meeting-space.png -- 6.11kb -> 4.87kb (20.21%)
/static/img/coffee.png -- 7.46kb -> 6.21kb (16.75%)
/static/img/og-image.jpg -- 89.27kb -> 76.99kb (13.76%)
/static/img/coffee-gear.png -- 5.17kb -> 4.46kb (13.59%)
/static/img/apple-touch-icon.png -- 1.60kb -> 1.58kb (1.4%)
/static/img/jumbotron.jpg -- 133.35kb -> 132.83kb (0.39%)

Author: ImgBotApp