default mock data

label: Chapter navigation
items:
  - title: Chapter 1 title
    url: url
    below:
      - title: Section 1.1 title
        url: url
      - title: Section 1.2 title
        url: url
        below:
          - title: Sub-section 1.2.1 title
            url: url
          - title: Sub-section 1.2.2 title
            url: url
            in_active_trail: true
          - title: Sub-section 1.2.3 title
            url: url
          - title: Sub-section 1.2.4 title
            url: url
      - title: Section 1.3 title
        url: url
  - title: Chapter 2 title
    url: url
  - title: Chapter 3 title
    url: url
    below:
      - title: Section 3.1 title
        url: url
      - title: Section 3.2 title
        url: url

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