Add cropped parabola from CI

Embed the plot of the cropped parabola from the artifacts of the CI.

README.md

@@ -131,6 +131,9 @@ the cropped parabola f(x), which is limited y=4 for x>=2.
             \end{array}\right\.
 ```
 
+The final plot should look like this.
+!(Plot of cropped parabola)[https://srv.sauerburger.com/esel/FP-python-examples/-/jobs/artifacts/master/raw/cropped_parabola.eps?job=doxec_test]
+
 Create the file `func_plot.py` and add the following lines.
 
 <!-- Add additional files for non-X11 environment in CI -->
@@ -190,3 +193,4 @@ $ ls cropped_parabola.eps
 cropped_parabola.eps
 ```
 -->
+