fix: review

Author: AriPerkkio

docs/tutorialkit.dev/src/content/docs/guides/creating-content.mdx

@@ -37,7 +37,7 @@ This structure is reflected in the directory structure of your TutorialKit proje
 
 Navigate into one of these folders to see another folder that represents a **chapter**. Inside the chapter folder, you will find one or more **lesson** folders.
 
-You can also omit parts and chapters, if your tutorial doesn't need that deep hierarchy.
+You can also omit parts or chapters such that you only have lessons or only lessons and parts. Here are a few examples:
 
 <Tabs>
   <TabItem label="Structure">

packages/react/src/Nav.tsx

@@ -129,7 +129,7 @@ function NavListComponent({
     <Accordion.Root asChild collapsible type="single" defaultValue={`${level}-${activeItems[level]}`}>
       <ul className={classNames(className)}>
         {items.map((item, index) => (
-          <NavListItem key={index} {...item} index={index} level={level} activeItems={activeItems} i18n={i18n} />
+          <NavListItem key={item.id} {...item} index={index} level={level} activeItems={activeItems} i18n={i18n} />
         ))}
       </ul>
     </Accordion.Root>
@@ -171,11 +171,11 @@ function NavListItem({ level, type, index, i18n, activeItems, id, title, href, s
 
         <Accordion.Content className={navStyles.AccordionContent}>
           <NavListComponent
-            className="mt-1.5  pl-4.5"
+            className="mt-1.5 pl-4.5"
             items={sections}
             activeItems={activeItems}
             i18n={i18n}
-            level={1 + level}
+            level={level + 1}
           />
         </Accordion.Content>
       </li>