refactor: use markdown syntax

Author: mcanouil

src/resources/projects/website/listing/_metadata.ejs.md

@@ -2,9 +2,9 @@
 const categories = item.categories !== undefined ? item.categories.join(',') : undefined;
 %>
 
-```{=html}
-<div class="quarto-listing-item-metadata" style-"display:none;">
-<span class="original-value" data-original-value="${itemNumber}" style="display:none;"></span>
-<% if (categories !== undefined) { %><span class="categories" data-categories="${categories}" style="display:none;"></span><% } %>
-</div>
-```
+::: {.quarto-listing-item-metadata" style-"display:none;"}
+[]{.original-value data-original-value="${itemNumber}" style="display:none;"}
+<% if (categories !== undefined) { %>
+[]{.categories data-categories="${categories}" style="display:none;"}
+<% } %>
+:::