Fixes image paths to work with docs-assembler.
Notes for the reviewer:
* I was not able to get images in reference, extend, or release-notes to
work using the `:::{image}` syntax because it seems to resolve
differently than the Markdown `![]()` syntax. We should address this in
docs-builder, but in order to get images working as soon as possible,
I've used Markdown syntax and left us a `TO DO` in a code comment to add
back the `screenshot` class where applicable.
* Can you please add the appropriate labels needed for backporting?
