Add images to HTML tools lesson

[jdwilkin4]

Here is the lesson

https://www.freecodecamp.org/learn/full-stack-developer/lecture-working-with-html-tools/how-to-use-the-dom-inspector-and-devtools

It could benefit from adding the images from the original hashnode script. Someone from the curriculum team can add those to the cdn here, then we can update the lesson.