Properly render the Card component metadata field

Problem/Motivation

The Rivet Card component contains a "metadata" field which is present on the backend Paragraph Edit form, but is never rendered on the front end.

See https://rivet.iu.edu/components/card/?example=card-with-image-and-metadata

Proposed resolution

Properly render the card metadata field in templates/paragraph--iu-feature.html.twig

 {% if meta %}
 <div class="rvt-card__meta">
   {{ meta }}
 </div>
 {% endif %}

Remaining tasks

User interface changes

API changes

Data model changes