$1 on a shell has a special meaning and inside of double quotes (") it will be expaned to an empty string. Using single quotes fixes the issue.
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| .. | ||
| deploy | ||
| examples | ||
| images | ||
| user-guide | ||
| development.md | ||
| extra.css | ||
| how-it-works.md | ||
| index.md | ||
| troubleshooting.md | ||