logo lints

        {% link_to 'home' %}
          <img src="{{ site.metafields.theme.logo_black }}"
               data-src-retina="{{ site.metafields.theme.logo_black_retina }}"
               class="logo"
               width="152" height="21" alt="">
        {% endlink_to %}

        {% link_to 'home' %}
          <img src="{{ site.metafields.theme.logo_white }}"
               data-src-retina="{{ site.metafields.theme.logo_white_retina }}"
               class="alt"
               width="152" height="21" alt="">
        {% endlink_to %}

metafields_schema.yml

office:
  position: 0
  label:
    default: "Office"
  fields:
    address:
      label: "Address"
      hint: "Ex: 7 allee Albert Camus"
      type: string
    postcode:
      label: "Postcode"
      hint: "Digits only"
      type: string
    city:
      label: "Stad"
      hint: "Chicago, Paris, Blagnac, Toulouse"
      type: string
    country:
      label: "Land"
      type: string
      hint: "The Netherlands"
theme:
  position: 1
  label:
    default: "Theme"
  fields:
    logo_white:
      label: 'Site logo'
      type: image
      hint: 'Change your Site logo (50px by 50px). Automatically cropped'
    logo_white_retina:
      label: 'Site logo for retina'
      type: image
      hint: 'Change your Site logo (100px by 100px). Automatically cropped'
    logo_black:
      label: 'Site logo'
      type: image
      hint: 'Change your Site logo (50px by 50px). Automatically cropped'
    logo_black_retina:
      label: 'Site logo for retina'
      type: image
      hint: 'Change your Site logo (100px by 100px). Automatically cropped'

site.yml

name: "Ondernemers Kontakt Arnhem"
locales: [nl]
domains: []
timezone: "UTC"
seo_title:
meta_keywords:
meta_description:
...
metafields:
  office:
    address: 'Tivolilaan 205'
    postcode: '6824 BV'
    city: 'Arnhem'
    country: 'The Netherlands'
  theme:
    logo_white: '/samples/logo_black.png'
    logo_white_retina: '/samples/logo_black_2x.png'
    logo_black: '/samples/logo_black.png'
    logo_black_retina: '/samples/logo_black_2x.png'