Fix actions to use deploy-pages

[lwasser]

This is our deployment job for the website:
We need to update the deploy job and pin all steps for a more secure workflow in the build-book action.

# Deployment job
  deploy:
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    runs-on: ubuntu-latest
    needs: build
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 #v5