{% if cookiecutter.layout == "book" %}nav:
  - Home: index.md
  - Description:{% for chapter in cookiecutter.chapters %}
    - '{{ chapter }}.md'{% endfor %}
    - 'references.md'{% if cookiecutter.data %}
  - Data: data{% endif %}
{%else%}
nav:
    - index.md
{%endif%}
collapse_single_pages: true
