main:
    - title: Download
      url: '/download'
    - title: Documentation
      url: 'http://api.projectchrono.org'
      sub:
       -
         title: Chrono Development Branch
         url: 'http://api.projectchrono.org/development'
       -
         title: Chrono 5.0.0
         url: 'http://api.projectchrono.org/5.0.0'
       -
         title: Chrono 4.0.0
         url: 'http://api.projectchrono.org/4.0.0'
       -
         title: FAQ
         url: '/faq/'
       -
         title: PyChrono
         url: '/pychrono/'
       -
         title: Validation Studies
         url: '/validation/'
       -
         title: White Papers
         url: '/whitepapers/'
    - title: Movies
      url: '/gallery/'
      sub:
       -
         title: Gallery
         url: '/gallery/'
       -
         title: SBEL
         url: 'http://sbel.wisc.edu/Animations/'
       -
         title: On Vimeo
         url: 'https://vimeo.com/uwsbel'
    - title: News
      url: '/news/'
    - title: Forum
      url: '/forum/'
    - title: About
      url: '/about/'
      sub:
       -
         title: Quick Facts
         url: '/about/'
       -
         title: Current/Past Users
         url: '/testimonials/'
       -
         title: Consulting
         url: '/consulting/'
    # - title: Old Website
    #   url: 'http://old.projectchrono.org'
    - title: Status
      url: '/status'

main:
    - title: Download
      url: '/download'
    - title: Documentation
      url: 'http://api.projectchrono.org'
      sub:
       -
         title: Chrono Development Branch
         url: 'http://api.projectchrono.org/development'
       -
         title: Chrono 6.0.0
         url: 'http://api.projectchrono.org/6.0.0'
       -
         title: Chrono 5.0.0
         url: 'http://api.projectchrono.org/5.0.0'
       -
         title: FAQ
         url: '/faq/'
       -
         title: PyChrono
         url: '/pychrono/'
       -
         title: Validation Studies
         url: '/validation/'
       -
         title: White Papers
         url: '/whitepapers/'
    - title: Movies
      url: '/gallery/'
      sub:
       -
         title: Gallery
         url: '/gallery/'
       -
         title: SBEL
         url: 'http://sbel.wisc.edu/Animations/'
       -
         title: On Vimeo
         url: 'https://vimeo.com/uwsbel'
    - title: News
      url: '/news/'
    - title: Forum
      url: '/forum/'
    - title: About
      url: '/about/'
      sub:
       -
         title: Quick Facts
         url: '/about/'
       -
         title: Current/Past Users
         url: '/testimonials/'
       -
         title: Consulting
         url: '/consulting/'
    # - title: Old Website
    #   url: 'http://old.projectchrono.org'
    - title: Status
      url: '/status'

Update navigation bar (add link to 6.0 documentation, remove link to 4.0 documentation)
Update navigation bar (add link to 6.0 documentation, remove link to 4.0 documentation)
