Fix eslint errors (#1734)

src/components/CodeEditor/CodeEditor.js

@@ -43,7 +43,7 @@ class CodeEditor extends Component {
   }
 
   render() {
-    const {children, containerNodeID} = this.props;
+    const {containerNodeID} = this.props;
     const {
       compiledES6,
       code,

src/templates/components/Sidebar/Section.js

@@ -81,10 +81,7 @@ class Section extends React.Component {
                   ? activeItemId === item.id
                   : isItemActive(location, item),
                 item: section.isOrdered
-                  ? {
+                  ? {...item, title: `${index + 1}. ${item.title}`}
-                      ...item,
-                      title: `${index + 1}. ${item.title}`,
-                    }
                   : item,
                 location,
                 onLinkClick,