feat: add ros2 turtlebot codelab

[Nick Hehr (HipsterBrown)]

TODO:

• add images
• add demo gif/video

[Joyce Lin (loopDelicious)]

• Oh my - so many robot components, but I don't hate it for repetition reasons and conveying Viam's modularity benefits.
• I like the Teleop progression - it's a good template for future teleop demos
• I would love to film 2 demo videos next week, based on Steps 7 and 8 - Control your ROS2 robot with Viam teleop, Monitor your ROS2 robot with Viam data capture - if you'd like to work together on them.
• Is it worth linking to Felix's Flutter blog on the Next Steps page? https://www.viam.com/post/integrate-your-ros2-robot-with-viam
• On the first page (the most important page), would include a compelling image of the turtlebot (better if you have the keyboard control superimposed on it), and the ROS2 architecture diagram for a visual glimpse of why we're talking about ROS2 and Viam in the same breath.