updated link to F-SAR data

fixes #5

tomography_tutorial/tutorial.ipynb

@@ -64,7 +64,7 @@
     "### define input parameters\n",
     "This is the only box which needs to be changed, all others runs automatically.  \n",
     "Two directories need to be defined with `/` as separator:\n",
-    "* `inpath` a directory containing all the files provided with this tutorial. You can download them [here](https://eo-college.org/Data/Tomography/tomography_data.zip).  \n",
+    "* `inpath` a directory containing all the files provided with this tutorial. You can download them [here](https://cloud.uni-jena.de/s/9o8r4zs2D852HdT).  \n",
     "* `outpath` will be used by the notebook to write intermediate and final results to disk.\n",
     "\n",
     "Furthermore, two processing parameters can be adjusted:\n",