187 - Fix homepage group image URL

[A-Souhei]

Description

Closes fjelltopp/zarr-ckan#187

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[ChasNelson1990]

What is the difference between image_url and image_display_url? Because it works fine on my local system and on staging "as is"

[A-Souhei]

It does not work on my local setup, may be I need to reset it then. I will look at it but right now image_display_url is used in core CKAN group/snippets/group_item.html:

  {% block image %}
    <img src="{{ group.image_display_url or h.url_for_static('/base/images/placeholder-group.png') }}" alt="{{ group.name }}" class="media-image img-fluid">
  {% endblock %}

[A-Souhei]

I put it as draft to prevent accidental merge.