docs: update coreos banner
docs: update coreos banner

flandr/fleet,wuqixuan/fleet,ecnahc515/fleet,mwitkow-io/fleet,bcwaldon/fleet,mwhooker/fleet,paveltiunov/fleet,thepwagner/fleet,mwitkow/fleet,endocode/fleet,mookjp/fleet,WPMedia/fleet,bviswana101/fleet,bcwaldon/fleet,mookjp/fleet,mwhooker/fleet,improbable-io/fleet,flandr/fleet,endocode/fleet,thepwagner/fleet,mischief/fleet,hhoover/fleet,WPMedia/fleet,dongsupark/fleet,hhoover/fleet,coreos/fleet,dongsupark/fleet,dalbani/fleet,coreos/fleet,bviswana101/fleet,dalbani/fleet,webwlsong/fleet,endocode/fleet,esatterwhite/fleet,paveltiunov/fleet,bcwaldon/fleet,octoblu/fleet,mwitkow-io/fleet,giantswarm/fleet,mischief/fleet,jonboulle/fleet,mwitkow/fleet,jonboulle/fleet,giantswarm/fleet,ecnahc515/fleet,wuqixuan/fleet,jonboulle/fleet,improbable-io/fleet,esatterwhite/fleet,ecnahc515/fleet,octoblu/fleet,coreos/fleet,dalbani/fleet,webwlsong/fleet,improbable-io/fleet,giantswarm/fleet,dongsupark/fleet