Add Node.js setup and MyST CLI installation to deployment workflow

Author: aaronjnewman

.github/workflows/deploy.yml

@@ -38,6 +38,12 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '18'
+      - name: Install MyST CLI
+        run: npm install -g mystmd
       - name: Set up Python
         uses: actions/setup-python@v5
         with: