Add tutorial package to repos

ros_workshop.repos

 repositories:
   src/kamaro_gamepad:
     type: git
-    url: ssh://git@gitlab.kamaro-engineering.de/kamaro/kamaro_gamepad.git
-    version: cassiopeia
-  src/kamaro_gazebo:
-    type: git
-    url: ssh://git@gitlab.kamaro-engineering.de/kamaro/kamaro_gazebo.git
+    url: https://gitlab.kamaro-engineering.de/kamaro-public/kamaro_ros_tutorial.git
     version: master