doc pages: add link to git repo

docs/config.json

@@ -17,7 +17,7 @@
             "basepath": "https://git-repo.iml.unibe.ch/iml-open-source/multi_ssh/tree/main/docs"
         },
         "links": {
-            "Git Repo": "__GITURL__",
+            "Git Repo": "https://git-repo.iml.unibe.ch/iml-open-source/multi_ssh/",
             "IML Opensource": "https://os-docs.iml.unibe.ch/multi_ssh/"
         },
         "theme": "daux-blue",