Allow displaying date

src/commands.rs

     );
     let default_post_listing_item_template = format!(
         "<li>
-  <a href=\"/posts/{{{{ slug }}}}/\">{{{{ title }}}}</a>
+  {{ date }} <a href=\"/posts/{{{{ slug }}}}/\">{{{{ title }}}}</a>
 </li>\n"
     );
 
                 .replace("  ", "")
         );
         assert_eq!(
-            format!("<li><a href=\"/posts/{{{{ slug }}}}/\">{{{{ title }}}}</a></li>"),
+            format!("<li>{{ date }} <a href=\"/posts/{{{{ slug }}}}/\">{{{{ title }}}}</a></li>"),
             fs::read_to_string(&project_dir.join("templates").join("post_listing_item.html"))
                 .unwrap()
                 .replace("\n", "")

src/render.rs

         )
         .replace(
             "{{ contents }}",
-            &post_template.replace("{{ title }}", &post.title).replace(
-                "{{ body }}",
-                &markdown_to_html(&post.body, &ComrakOptions::default()),
-            ),
+            &post_template
+                .replace("{{ title }}", &post.title)
+                .replace(
+                    "{{ body }}",
+                    &markdown_to_html(&post.body, &ComrakOptions::default()),
+                )
+                .replace("{{ date }}", &post.date.format("%Y-%m-%d").to_string()),
         )
 }
 
                         post_item_template
                             .replace("{{ slug }}", &post.slug)
                             .replace("{{ title }}", &post.title)
+                            .replace("{{ date }}", &post.date.format("%Y-%m-%d").to_string())
                     })
                     .collect::<Vec<String>>()
                     .join("\n"),