New icon for Muon Discover

Thanks to Christian Díaz for his time, creativity and work :)



M +- -- discover/icons/hi128-app-muondiscover.png
M +- -- discover/icons/hi16-app-muondiscover.png
M +- -- discover/icons/hi22-app-muondiscover.png
M +- -- discover/icons/hi32-app-muondiscover.png
M +- -- discover/icons/hi48-app-muondiscover.png
M +- -- discover/icons/hisc-app-muon-discover.svgz