Change contrast of status links that are not mentions nor hashtags (#11406)

app/javascript/mastodon/components/status_content.js

@@ -55,6 +55,7 @@ export default class StatusContent extends React.PureComponent {
         link.addEventListener('click', this.onHashtagClick.bind(this, link.text), false);
       } else {
         link.setAttribute('title', link.href);
+        link.classList.add('unhandled-link');
       }
 
       link.setAttribute('target', '_blank');

app/javascript/styles/mastodon/components.scss

@@ -753,6 +753,10 @@
     }
   }
 
+  a.unhandled-link {
+    color: lighten($ui-highlight-color, 8%);
+  }
+
   .status__content__spoiler-link {
     background: $action-button-color;