Conversion to uv of the gh action

Author: blais

.github/workflows/docs.yml

@@ -17,11 +17,10 @@ jobs:
     steps:
       - uses: actions/configure-pages@v5
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: astral-sh/setup-uv@v5
         with:
-          python-version: 3.x
-      - run: pip install zensical
-      - run: zensical build --clean --config-file zensical.yml
+          enable-cache: true
+      - run: uv run zensical build --clean --config-file zensical.yml
       - uses: actions/upload-pages-artifact@v4
         with:
           path: site