Fix the links to the blog posts.

src/command/build/render.rs

@@ -77,8 +77,7 @@ impl SiteRenderer {
             for blog_post_page in &blog_post.pages {
                 let output_path = self
                     .output_directory
-                    .join("posts")
-                    .join(&blog_post.id)
+                    .join(config.get_relative_path_to_post(&blog_post.id))
                     .join(blog_post_page.get_output_path());
 
                 let convert_input = RenderBlogPostPageInput::new(blog_post, blog_post_page);