Can't find any of the "real application packages" referenced in the top-level README.md file

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## Issue template

- Version or commit hash: galactic branch

#### Steps to reproduce the issue
In [README.md](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#real-application-packages), there is reference to the following packages:
- [rad0_actuator](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_actuator)
- [rad0_altitude_sensor](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_altitude_sensor)
- [rad0_control](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_control)
- [rad0_display](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_display)

However, I can't seem to find that code anywhere. Would you mind adding github links to the corresponding source files for those sections?

The only package I see that seems related is the [RAD0_control](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic/rclcpp/RAD0_control) package, but that doesn't have any of the functionality referenced above.

Überprüfe den Abschnitt „Real Application Packages“ in README.md und vergleiche seine Verweise auf rad0_actuator, rad0_altitude_sensor, rad0_control und rad0_display mit den Inhalten des Repositorys. Prüfe das vorhandene rclcpp/RAD0_control-Paket und aktualisiere anschließend den Abschnitt mit Links zu den entsprechenden Quellcodepositionen oder korrigierten Verweisen, damit jedes aufgeführte Paket auffindbar ist.

Vom Indexierungsmodell aus dem Issue-Text verfasst.