Add warning when Pixiv post is a gallery of multiple images

app/assets/javascripts/uploads.js

@@ -85,6 +85,12 @@
 
     $("#source-record").html(new_artist_link);
 
+    if (data.page_count > 1) {
+      $("#gallery-warning").show();
+    } else {
+      $("#gallery-warning").hide();
+    }
+
     $("#source-info span#loading-data").hide();
     $("#source-info ul").show();
   }

app/assets/stylesheets/specific/uploads.css.scss

@@ -26,7 +26,7 @@ div#c-uploads {
       margin: 1em 0;
       padding: 1em;
       border: 1px solid gray;
-      min-height: 4em;
+      min-height: 5em;
 
       p {
         margin: 0;