Add documentation link to README.

Signed-off-by: David Oberacker <[email protected]>

Author: Oberacda

.github/workflows/sphinx_doc.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches:
         - main
-        - fb_gh_pages_sphinx_doc
 
 permissions:
   contents: write

README.md

@@ -2,7 +2,7 @@
 
 [![ROS Industrial CI](https://github.com/fzi-forschungszentrum-informatik/ros2_ros_bt_py/actions/workflows/industrial_ci.yml/badge.svg)](https://github.com/fzi-forschungszentrum-informatik/ros2_ros_bt_py/actions/workflows/industrial_ci.yml)
 [![codecov](https://codecov.io/gh/fzi-forschungszentrum-informatik/ros2_ros_bt_py/graph/badge.svg?token=CRF3GMWWG3)](https://codecov.io/gh/fzi-forschungszentrum-informatik/ros2_ros_bt_py)
-
+[![Documentation](https://img.shields.io/badge/Documentation-Github_Pages-blue)](https://fzi-forschungszentrum-informatik.github.io/ros2_ros_bt_py/index.html)
 ---
 
 This is a [Behavior Tree](https://en.wikipedia.org/wiki/Behavior_tree_(artificial_intelligence,_robotics_and_control)) library meant to be an alternative to [BehaviorTree.cpp](https://www.behaviortree.dev/), [SMACH](http://wiki.ros.org/smach), [FlexBE](http://wiki.ros.org/flexbe) and the like.