rm username and message count from viewer-info (#258)

web/pages/viewer-info.tsx

@@ -57,21 +57,6 @@ export default function ViewersOverTime() {
   }
 
   const columns = [
-    {
-      title: 'User name',
-      dataIndex: 'username',
-      key: 'username',
-      render: username => username || '-',
-      sorter: (a, b) => a.username - b.username,
-      sortDirections: ['descend', 'ascend'] as SortOrder[],
-    },
-    {
-      title: 'Messages sent',
-      dataIndex: 'messageCount',
-      key: 'messageCount',
-      sorter: (a, b) => a.messageCount - b.messageCount,
-      sortDirections: ['descend', 'ascend'] as SortOrder[],
-    },
     {
       title: 'Connected Time',
       dataIndex: 'connectedAt',