Update publish.yml

Author: willow-ahrens

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Output to HTML
         uses: netwerk-digitaal-erfgoed/bikeshed-action@v1
         with:
-          source: spec/latest.bs
+          source: spec/latest/index.bs
 
       - name: Publish HTML to GitHub Pages
         if: success()