CI: update pkgdown to latest recommendend workflow

.github/workflows/pkgdown.yaml

@@ -28,8 +28,16 @@ jobs:
         with:
           extra-packages: pkgdown
 
-      - name: Deploy package
-        run: |
-          git config --local user.name "$GITHUB_ACTOR"
-          git config --local user.email "$GITHUB_ACTOR@users.noreply.github.com"
-          Rscript -e 'pkgdown::deploy_to_branch(new_process = FALSE)'
+      - name: Build site
+        run: pkgdown::build_site_github_pages(new_process = FALSE, install = FALSE)
+        shell: Rscript {0}
+
+      - name: Deploy to GitHub pages
+        if: github.event_name != 'pull_request'
+        uses: JamesIves/github-pages-deploy-action@v4.4.1
+        with:
+          clean: false
+          branch: gh-pages
+          folder: docs
+          git-config-name: ${{ github.actor }}
+          git-config-email: ${{ github.actor }}@users.noreply.github.com