[ImgBot] Optimize images

*Total -- 443.02kb -> 415.17kb (6.29%)

/vendor/mgp25/instagram-php/examples/assets/instagram.png -- 7.63kb -> 5.17kb (32.27%)
/img/rand.jpg -- 228.95kb -> 213.89kb (6.58%)
/rand.jpg -- 206.44kb -> 196.11kb (5.01%)

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

Author: ImgBotApp