fix: template defects

src/components/Navigations/PathNode.js

@@ -86,12 +86,13 @@ const PathNode = ({ path, isRoot = false }) => {
                     <MarkdownNode
                         markdown={markdown}
                         handleMoveMarkdown={handleMoveMarkdown}
+                        key={markdown.id}
                     />
                 ))}
             </ul>
         );
     return (
-        <li>
+        <li key={path.id}>
             <div className="path-node-header field has-addons">
                 <span className="control has-text-weight-bold path-toggle" onClick={isRoot ? undefined : toggleExpand}>
                         {isExpanded ? "-" : "+"}