ci: fix GitHub pages

Author: gjasny

.github/workflows/doxygen.yml

@@ -15,9 +15,6 @@ jobs:
     permissions:
       pages: write
       id-token: write
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
     steps:
       - name: Checkout source
         uses: actions/checkout@v6