chore(dev): update devcontainer.json format

.devcontainer.example/devcontainer.json

@@ -3,6 +3,8 @@
   "dockerComposeFile": ["../docker-compose.yml", "docker-compose.yml"],
   "service": "app",
   "workspaceFolder": "/app",
+  "customizations": {
+    "vscode": {
       "settings": {
         "terminal.integrated.defaultProfile.linux": "fish",
         "terminal.integrated.profiles.linux": {
@@ -23,7 +25,9 @@
         "esbenp.prettier-vscode",
         "artdiniz.quitcontrol-vscode",
         "bradlc.vscode-tailwindcss"
-  ],
+      ]
+    }
+  },
   "runServices": ["app"],
   "shutdownAction": "stopCompose"
 }