Remove source build statistics from README (#260)

Author: christophfroehlich

README.md

@@ -81,9 +81,9 @@ Those two world-known imaginary robots are trivial simulations to demonstrate an
 
 ROS 2 Distro | Branch | Build status | Documentation
 :----------: | :----: | :----------: | :-----------:
-**Rolling** | [`master`](https://github.com/ros-controls/ros2_control_demos/tree/rolling) | [![Rolling Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-binary-build.yml/badge.svg?branch=master)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-binary-build.yml?branch=master) <br /> [![Rolling Semi-Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-semi-binary-build.yml/badge.svg?branch=master)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-semi-binary-build.yml?branch=master) <br /> [![Rolling Source Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-source-build.yml/badge.svg?branch=master)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-source-build.yml?branch=master) | [Documentation](https://control.ros.org/master/index.html) <br /> [API Reference](https://control.ros.org/master/doc/api/index.html)
-**Galactic** | [`galactic`](https://github.com/ros-controls/ros2_control_demos/tree/galactic) | [![Galactic Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-binary-build.yml/badge.svg?branch=galactic)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-binary-build.yml?branch=galactic) <br /> [![Galactic Semi-Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-semi-binary-build.yml/badge.svg?branch=galactic)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-semi-binary-build.yml?branch=galactic) <br /> [![Galactic Source Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-source-build.yml/badge.svg?branch=galactic)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-source-build.yml?branch=galactic) | [Documentation](https://control.ros.org/galactic/index.html) <br /> [API Reference](https://control.ros.org/galactic/doc/api/index.html)
-**Foxy** | [`foxy`](https://github.com/ros-controls/ros2_control_demos/tree/foxy) | [![Foxy Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-binary-build.yml/badge.svg?branch=foxy)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-binary-build.yml?branch=foxy) <br /> [![Foxy Semi-Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-semi-binary-build.yml/badge.svg?branch=foxy)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-semi-binary-build.yml?branch=foxy) <br /> [![Foxy Source Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-source-build.yml/badge.svg?branch=foxy)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-source-build.yml?branch=foxy) | [Documentation](https://control.ros.org/foxy/index.html) <br /> [API Reference](https://control.ros.org/foxy/doc/api/index.html)
+**Rolling** | [`master`](https://github.com/ros-controls/ros2_control_demos/tree/rolling) | [![Rolling Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-binary-build.yml/badge.svg?branch=master)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-binary-build.yml?branch=master) <br /> [![Rolling Semi-Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-semi-binary-build.yml/badge.svg?branch=master)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/rolling-semi-binary-build.yml?branch=master) <br /> | [Documentation](https://control.ros.org/master/index.html) <br /> [API Reference](https://control.ros.org/master/doc/api/index.html)
+**Galactic** | [`galactic`](https://github.com/ros-controls/ros2_control_demos/tree/galactic) | [![Galactic Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-binary-build.yml/badge.svg?branch=galactic)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-binary-build.yml?branch=galactic) <br /> [![Galactic Semi-Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-semi-binary-build.yml/badge.svg?branch=galactic)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/galactic-semi-binary-build.yml?branch=galactic) <br /> | [Documentation](https://control.ros.org/galactic/index.html) <br /> [API Reference](https://control.ros.org/galactic/doc/api/index.html)
+**Foxy** | [`foxy`](https://github.com/ros-controls/ros2_control_demos/tree/foxy) | [![Foxy Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-binary-build.yml/badge.svg?branch=foxy)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-binary-build.yml?branch=foxy) <br /> [![Foxy Semi-Binary Build](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-semi-binary-build.yml/badge.svg?branch=foxy)](https://github.com/ros-controls/ros2_control_demos/actions/workflows/foxy-semi-binary-build.yml?branch=foxy) <br /> | [Documentation](https://control.ros.org/foxy/index.html) <br /> [API Reference](https://control.ros.org/foxy/doc/api/index.html)
 
 ### Explanation of different build types