Implement a click-to-view spoiler system

app/assets/javascripts/extras.jsx

@@ -14,6 +14,16 @@ $(() => {
     }
   });
 
+  $.each($('.spoiler'), (_, content) => {
+    $(content).on('click', e => {
+      var hasClass = $(content).hasClass('spoiler-on');
+      if (hasClass || e.target === content) {
+        e.preventDefault();
+        $(content).siblings(".spoiler").andSelf().toggleClass('spoiler-on', !hasClass);
+      }
+    });
+  });
+
   $('.media-spoiler').on('click', e => {
     $(e.target).hide();
   });