Remove videos from personal/company youtube channel. (#6081)

Signed-off-by: Tomoya Fujita <[email protected]>

Author: fujitatomoya

source/Concepts.rst

@@ -15,8 +15,3 @@ Related Content
 ^^^^^^^^^^^^^^^
 
 :doc:`See the ROS 2 citations <Citations>` for more explanation of concepts and citable resources.
-
-For a brief video introduction to ROS 2, see this community contributed content:
-
-* `Getting started with ROS Part 1: Nodes, Parameters and Topics <https://youtu.be/46TPAKXBOF8>`_
-* `Getting started with ROS Part 2: Services and Actions <https://youtu.be/keZAJ83eEoM>`_

source/Concepts/Intermediate/About-RQt.rst

@@ -81,7 +81,3 @@ Further Reading
 * ROS 2 Discourse `announcement of porting to ROS 2 <https://discourse.ros.org/t/rqt-in-ros2/6428>`__)
 * `RQt for ROS 1 documentation <https://wiki.ros.org/rqt>`__
 * Brief overview of RQt (from `a Willow Garage intern blog post <http://web.archive.org/web/20130518142837/http://www.willowgarage.com/blog/2012/10/21/ros-gui>`__)
-
-  .. raw:: html
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-     <iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/CyP9wHu2PpY" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

source/Tutorials/Beginner-CLI-Tools/Introducing-Turtlesim/Introducing-Turtlesim.rst

@@ -263,5 +263,3 @@ Related content
 ---------------
 
 The turtlesim package can be found in the `ros_tutorials <https://github.com/ros/ros_tutorials/tree/{REPOS_FILE_BRANCH}/turtlesim>`_ repo.
-
-`This community contributed video <https://youtu.be/xwT7XWflMdc>`_ demonstrates many of the items covered in this tutorial.