[ImgBot] Optimize images (#679)
[ImgBot] Optimize images (#679)

/src/assets/images/sponsors/DataSTAGE_logo.png -- 18.95kb -> 15.69kb (17.24%)
dockstore/dockstore-ui2,dockstore/dockstore-ui2,dockstore/dockstore-ui2,dockstore/dockstore-ui2