Fix pip command

.github/workflows/pages.yml

@@ -33,7 +33,7 @@ jobs:
         with:
           python-version: "3.10"
       - name: Install sphinx env
-        run: python -m pip -r docs/requirements.txt
+        run: python -m pip install -r docs/requirements.txt
       - name: Build documentation
         run: sphinx-build -b html -a -W -T docs _pages
       - name: Upload artifact