Review usage of image in SDDS components

Jacob and I got this working yesterday by:

Add to yaml:

    image:
      $ref: json-schema-definitions://experience_builder.module/image
      type: object
      title: Image
      examples:
        - src: https://placehold.co/600x400.png
          alt: 'placeholder'
          width: 600
          height: 400

Update twig to use image.src instead of image.url to match XB schema:

        {% block image %}
          {% if image is not empty %}
            <div class="ct-campaign__image">
              {% include '@atoms/image/image.twig' with {
                theme: theme,
                url: image.src,
                alt: image.alt,
              } only %}
            </div> 
          {% endif %}
        {% endblock %}

but found this bug:

🐛 Redux support for ImageWidget: `[image] String value found, but an object is required` Postponed

which the XB team are trying to fix now.

So... in the meantime, we can put the image code in how we want it. Then, when we test the props, we have to comment it out to test.

Done and merged. Thanks!