Adds table of contents. Removes now from the top level of the sidebar.

src/pages/blog/[...slug].astro

@@ -14,9 +14,9 @@ type Props = CollectionEntry<'blog'>;
 
 const post = Astro.props;
 const { slug } = Astro.params;
-const { Content } = await render(post);
+const { Content, headings } = await render(post);
 ---
 
-<BlogPost slug={slug} {...post.data} >
+<BlogPost slug={slug} headings={headings} {...post.data} >
 	<Content />
 </BlogPost>