Update bodyPose skeleton diagram url

[QuinnHe]

Instead of using url to third-party sources, maybe we should consider saving the diagrams as static assets to our own repo. Maybe we can also consider drawing our own version of the keypoint diagram. cc @MOQN @alanvww @XiaozaoWang @myrahsa

[alanvww]

Yes, the simplest way would be to have them as static images in the docs/assets folder. I’ll try to recover the images so it won't keep showing the broken link. It would be fantastic if we could have an updated version of them tho :D

[alanvww]

The diagram issue has been resolved in the pull request above. However, we should also consider updating the images in the “Getting Started” section with the most recent update to the p5 web editor. The UI is slightly different.