refactor the FE parts

src/components/link-preview/link-preview.js

@@ -1,8 +1,21 @@
 const LinkPreview = {
   name: 'LinkPreview',
   props: [
-    'card'
-  ]
+    'card',
+    'size',
+    'nsfw'
+  ],
+  computed: {
+    useImage () {
+      // Currently BE shoudn't give cards if tagged NSFW, this is a bit paranoid
+      // as it makes sure to hide the image if somehow NSFW tagged preview can
+      // exist.
+      return this.card.image && !this.nsfw && this.size !== 'hide'
+    },
+    useDescription () {
+      return this.card.description && /\S/.test(this.card.description)
+    }
+  }
 }
 
 export default LinkPreview