Remove one level /DiffDetective/ from the GitHub pages URL

Author: ibbem

.github/workflows/maven.yml

@@ -27,7 +27,7 @@ jobs:
       if: ${{ github.event_name == 'push' && github.event.ref == 'refs/heads/main' }}
       uses: actions/upload-pages-artifact@v1
       with:
-        path: result/share/github-pages
+        path: result/share/github-pages/DiffDetective
 
   # An additional job is recommened in the documentation of `actions/deploy-pages`
   deploy-javadoc: