Move example files into their own directory

[binkley]

Just like with images, put the example output files into their own directory.
Move them to etc.

This card cannot be fully completed. GitHub does not support markdown pages in subdirectories.
See: https://github.com/orgs/community/discussions/23914#discussioncomment-5447162

See #534 for the epic encompassing this card.

[jwlibby]

To be fair, it kind of makes sense that you can't have subfolders on a wiki, in that a wiki is meant to be non-hierarchical. We are basically using a wiki to make something that is meant to be read linearly and has a hierarchical structure. Wikis inherently are neither of these. Marking as complete as we already have other cards to consider moving off of the wiki.