PCCSP: don't use GitHub blob image

Author: glebbelov

authors/glebbelov/scheduling/color_change/color_change_scheduling.ipynb

@@ -87,7 +87,7 @@
         "|  |  |  |  |  |\n",
         "|---|---|---|---|---|\n",
         "| | |\n",
-        "![Car part sequence painting](https://github.com/ampl/colab.ampl.com/blob/7c0df6d65484d0d69801ce42a8aec950ea1e1ee8/authors/glebbelov/scheduling/color_change/img/car_par_paint.webp?raw=true)\n",
+        "![Car part sequence painting]()\n",
         "| aimtecglobal.com | |\n",
         "\n",
         "We set up the model and manually adjust FICO Xpress parameters."