markdown with GFM extension

src/routes/posts.rs

@@ -52,7 +52,8 @@ pub async fn see_post(
         .await
         .context(format!("Failed to fetch post #{}", post_id))
         .map_err(AppError::unexpected_page)?
-        .to_html();
+        .to_html()
+        .context("Could not render markdown with extension.")?;
     let template = PostTemplate { post };
     Ok(Html(template.render().unwrap()).into_response())
 }