fix deploy error in default workflow @ alshedivat/al-folio#1545 (comment)

Author: upunaprosk

.github/workflows/jekyll.yml

@@ -39,6 +39,18 @@ jobs:
           ruby-version: '3.1' # Not needed with a .ruby-version file
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
           cache-version: 0 # Increment this number if you need to re-download cached gems
+      - name: Install Node.js for Mermaid CLI
+        uses: actions/setup-node@v3
+        with:
+          node-version: "14"
+      - name: Install Mermaid CLI
+        run: npm install -g @mermaid-js/mermaid-cli
+      - name: Install Python for Jupyter
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.9"
+      - name: Install Jupyter
+        run: pip install jupyter
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5