chore(still-image): makes the iiifUrl string a link that can be click…

…ed on the open the image in a new tab

src/app/workspace/resource/representation/still-image/still-image.component.html

@@ -6,7 +6,7 @@
                 <span class="caption mat-caption">{{imageCaption}}</span>
             </div>
             <div class="bottom">
-                <span class="iiif mat-caption">{{iiifUrl}}</span>
+                <a href="{{iiifUrl}}" target="_blank" class="iiif mat-caption">{{iiifUrl}}</a>
             </div>
         </div>
         <!-- caption -->