add repo link

Author: mikebarkmin

hyperbook.json

@@ -4,6 +4,7 @@
   "search": true,
   "version": "0.0.1",
   "description": "In diesem Hyperbook lernst du viele Themen der Informatik kennen.",
+  "repo": "https://github.com/openpatch/hyperbook-informatik/edit/main",
   "author": {
     "name": "OpenPatch",
     "url": "https://openpatch.org"