Cleaned-up unused stuff

removed dummy text and links to Internetworking that weren't working.

README.md

 # Open Edu Materials
 
-The repository for collecting educational material from the [da/net research group](https://fbi.h-da.de/en/research/research-groups/networking-technologies) as open educational resources (oer). 
+The repository for collecting educational material from the [da/net research group](https://fbi.h-da.de/en/research/research-groups/networking-technologies) as open educational resources (oer).
+
+## License
+
+TODO: This has to be defined.
 
 ## About the da/net research group
 
-The [da/net research group](https://fbi.h-da.de/en/research/research-groups/networking-technologies) is part of the [computer science department ](https://fbi.h-da.de/) of the [University of Applied Sciences Darmstadt](https://h-da.de/). 
+The [da/net research group](https://fbi.h-da.de/en/research/research-groups/networking-technologies) is part of the [computer science department ](https://fbi.h-da.de/) of the [University of Applied Sciences Darmstadt](https://h-da.de/).
 
 The members of da/net are active in these broad areas, see the web site for detailed information):
 * fixed data networks

SUMMARY.md

 # Summary
 
 * [da/net OER](README.md)
-    * [Lorem Ipsum](dummy/README.md)
-        * [dolor sit amet]()
-    * [Teaching]()
-        * [Internetworking Winter 2020]()
     * [Managing Networks](manage-networks/README.md)
         * [Intro](manage-networks/Intro/README.md)
         * [YANG-GNMI Programming](manage-networks/yangnmi-prog/README.md)

dummy/README.md

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