Fixing ROS launch system (#8)

* We didnt have proper flagging in the online node

* Clean launch common args

* Fix formatting python

ros/launch/online_node.launch.py

@@ -2,6 +2,7 @@
 
 from ament_index_python.packages import get_package_share_directory
 from launch import LaunchDescription
+from launch.conditions import IfCondition
 from launch.launch_description_sources import (
     get_launch_description_from_python_launch_file,
 )