fix(v5): broken link and missing type annotations in tutorial (#10119)

src/content/docs/en/tutorial/5-astro-api/1.mdx

@@ -167,7 +167,7 @@ Try on your own to make all the necessary changes to your Astro project so that
     <BaseLayout pageTitle={pageTitle}>
       <p>This is where I will post about my journey learning Astro.</p>
       <ul>
-        {allPosts.map((post) => <BlogPost url={post.url} title={post.frontmatter.title} />)}
+        {allPosts.map((post: any) => <BlogPost url={post.url} title={post.frontmatter.title} />)}
       </ul>
     </BaseLayout>
     ```

src/content/docs/en/tutorial/5-astro-api/2.mdx

@@ -251,10 +251,10 @@ import BlogPost from '../../components/BlogPost.astro';
 export async function getStaticPaths() {
   const allPosts = Object.values(await import.meta.glob('../posts/*.md', { eager: true }));
   
-  const uniqueTags = [...new Set(allPosts.map((post) => post.frontmatter.tags).flat())];
+  const uniqueTags = [...new Set(allPosts.map((post: any) => post.frontmatter.tags).flat())];
 
   return uniqueTags.map((tag) => {
-    const filteredPosts = allPosts.filter((post) => post.frontmatter.tags.includes(tag));
+    const filteredPosts = allPosts.filter((post: any) => post.frontmatter.tags.includes(tag));
     return {
       params: { tag },
       props: { posts: filteredPosts },
@@ -268,7 +268,7 @@ const { posts } = Astro.props;
 <BaseLayout pageTitle={tag}>
   <p>Posts tagged with {tag}</p>
   <ul>
-    {posts.map((post) => <BlogPost url={post.url} title={post.frontmatter.title}/>)}
+    {posts.map((post: any) => <BlogPost url={post.url} title={post.frontmatter.title}/>)}
   </ul>
 </BaseLayout>
 ```

src/content/docs/en/tutorial/5-astro-api/3.mdx

@@ -361,7 +361,7 @@ const { frontmatter } = Astro.props;
   <img src={frontmatter.image.url} width="300" alt={frontmatter.image.alt} /> 
 
   <div class="tags">
-    {frontmatter.tags.map((tag) => (
+    {frontmatter.tags.map((tag: string) => (
       <p class="tag"><a href={`/tags/${tag}`}>{tag}</a></p>
     ))}
   </div>

src/content/docs/en/tutorial/6-islands/4.mdx

@@ -346,4 +346,4 @@ The tutorial blog project includes an RSS feed. This function must also use `get
     }
     ```
 
-For the full example of the blog tutorial using content collections, see the [Content Collections branch](https://github.com/withastro/blog-tutorial-demo/tree/content-layer) of the tutorial repo.
+For the full example of the blog tutorial using content collections, see the [Content Collections branch](https://github.com/withastro/blog-tutorial-demo/tree/content-collections) of the tutorial repo.