Actions: Switch Jekyll build to the one from GH Actions

The current Jekyll build is erroring out because it doesn't have a
GitHub token.  Instead of providing one, let's try the canned GitHub
Action.

.github/workflows/jekyll.yml

@@ -43,10 +43,7 @@ jobs:
         id: pages
         uses: actions/configure-pages@v5
       - name: Build with Jekyll
-        # Outputs to the './_site' directory by default
-        run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
-        env:
-          JEKYLL_ENV: production
+        uses: actions/[email protected]
       - name: Upload artifact
         # Automatically uploads an artifact from the './_site' directory by default
         uses: actions/upload-pages-artifact@v3