initial commit and website ci

SUMMARY.md

+# Summary
+
+* [da/net OER](README.md)
+    * [Lorem Ipsum](dummy/README.md)
+        * [dolor sit amet]()
+    * [Teaching]()
+        * [Internetworking Winter 2020]()
\ No newline at end of file

book.toml

+[book]
+authors = ["Manuel Kieweg"]
+language = "en"
+multilingual = false
+src = "."
+
+# [preprocessor.graphviz]
+# command = "mdbook-graphviz"
+
+[output.html]
+git-repository-url = "https://code.fbi.h-da.de/danet/internetworking"
+git-repository-icon = "fa-gitlab"
+site-url = "/public/"