fix: use skillFile path in search index for skills

When searching for skills on the homepage, clicking a result would fail
to load because the search index stored the folder path (e.g., skills/my-skill)
instead of the SKILL.md file path. This caused fetchFileContent() to fail.

Changed path property to use skill.skillFile which contains the correct
path to the SKILL.md file that can be fetched and displayed in the modal.

eng/generate-website-data.mjs

@@ -579,7 +579,7 @@ function generateSearchIndex(
       id: skill.id,
       title: skill.title,
       description: skill.description,
-      path: skill.path,
+      path: skill.skillFile,
       searchText: `${skill.title} ${skill.description}`.toLowerCase(),
     });
   }