Change "show hidden lines" icon to "eye" instead of "expand." #1281
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In a recent discussion in the amethyst docs discord channel,
it was suggested that using an "eye" icon might make the show hidden
lines feature of mdbook's code sample rendering more discoverable.
I myself overlooked the arrows that are in use now for longer than I'd like to admit.
Fixes #663 at least in part.
Some rendered output from the example book follows: