onCrashReboot uses following icon,
This icon is a variation of goal.svg, which is made by Freepik and is licensed under CC BY 3.0.
The logo.svg was converted to PNG using svgexport.
svgexport logo.svg logo.png 100%
The result logo.png was around 2Mb in size. ImageOptim, reduced the size by 99%.
Finally, shortcut icons were generated using iconifier web app.
These images files can be downloaded from the Github repository.