Make figcaption visible

Makes the figcaption Element for the post.html Template visible.

The figcaption content is now overlayed translucently on top of the image having the maximum width of one row. On hover it will expand to the full necessary height to display the whole content.

templates/blog/post.html

@@ -16,7 +16,7 @@
               <img src="{{ image.url }}" alt="{{ post.extra.depiction.alt }}" />
             {% if post.extra.depiction.credits %}
             <div class="caption">
-              <figcaption class="tag has-text-white has-background-black  is-size-7 is-italic m-1">{{ post.extra.depiction.credits }} aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaa bbbbbbbbbbbbbbbbbb</figcaption>
+              <figcaption class="tag has-text-white has-background-black  is-size-7 is-italic m-1">{{ post.extra.depiction.credits }}</figcaption>
             </div>
             {% endif %}
           </figure>