link to Binder instead of img file (#10)

* link pic to binder instead of file

Author: Sandra Mierz

README.md

@@ -25,7 +25,7 @@ While GitHub renders Jupyter notebooks as static HTML files (not executable),
 you can use this link to launch the notebooks on Binder where you can execute and modify them:
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/Project-TAPIR/pidgraph-notebooks/main)
 
-![Screenshot Binder](Binder.png)
+[![Screenshot Binder](Binder.png)](https://mybinder.org/v2/gh/Project-TAPIR/pidgraph-notebooks/main)
 
 ----------------------------