[ImgBot] Optimize images

*Total -- 2,711.67kb -> 2,698.87kb (0.47%)

/public/partners/ngrok.png -- 11.40kb -> 4.62kb (59.51%)
/public/partners/ngrok.svg -- 5.78kb -> 5.46kb (5.53%)
/public/icon.svg -- 0.12kb -> 0.11kb (4.1%)
/app/assets/images/news_cover.jpg -- 385.02kb -> 384.17kb (0.22%)
/public/img/ogp-news.jpg -- 385.02kb -> 384.17kb (0.22%)
/public/img/sotechsha2/1/01-a08_1.gif -- 1,924.34kb -> 1,920.33kb (0.21%)

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

Author: ImgBotApp