Standardize the construction of intermediate BlogPostPage.

src/intermediate/entity.rs

@@ -7,8 +7,14 @@ pub(crate) struct IEntity {
     pub(crate) html: String,
 }
 
-intermediate!(IEntity, Entity, original, _registry, {
-    Ok(IEntity {
-        html: original.html.to_owned(),
-    })
-});
+intermediate!(
+    IEntity,
+    &'orig organic::types::Entity<'parse>,
+    original,
+    _registry,
+    {
+        Ok(IEntity {
+            html: original.html.to_owned(),
+        })
+    }
+);