Show Example indicator

[codehag]

For examples, we add a section that says "show example" which indicates that clicking it will expand into a long code block:

This was mentioned in #101

It is currently not ideal. If anyone has ideas about how to adjust this, let's iterate on it. I tried what was suggested in #101, but I found that pulling it to the right moved it out of sight line when reading the descriptions.

Current version:

Closed

Open

[ljharb]

This could use a details tag, whether it starts open or closed.