[Humble]ROS2 is not installed

[vkuehn]

steps to reproduce on the humble branch

git clone the nanosaur repo
switch to humble branch
got to ../nanosaur/nanosaur/scripts
source nanosaur

message:
ROS2 is not installed in /opt/ros/foxy

it would be nice for those interested on the humble brunch to have some instructions on how to use it or is that a bug ?

also the nanosaur distro seem to not work anymore.