fix: checkout submodules in deploy workflow

Author: BD103

.github/workflows/deploy.yml

@@ -20,6 +20,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Install Zola
         uses: taiki-e/install-action@v2