added first stuff for site generation.

manage-networks/book.toml

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