fix images and JSON
fix images and JSON

Signed-off-by: Benjamin Cabé <fe09bc2ef2737a3258f978e26226dcbac1b3f948@eclipse.org>

eclipselabs/eclipseiot-testbed-productionperformancemanagement,eclipselabs/eclipseiot-testbed-productionperformancemanagement,eclipselabs/eclipseiot-testbed-productionperformancemanagement