Add markdown rendering for recipe descriptions using comrak

backend/src/html_templates.rs

@@ -18,6 +18,16 @@ impl Recipes {
     }
 }
 
+mod filters {
+    use askama::filters::Safe;
+    pub fn markdown<T: std::fmt::Display>(s: T) -> askama::Result<Safe<String>> {
+        Ok(Safe(comrak::markdown_to_html(
+            &s.to_string(),
+            &comrak::ComrakOptions::default(),
+        )))
+    }
+}
+
 #[derive(Template)]
 #[template(path = "home.html")]
 pub struct HomeTemplate {