add a script for update

package.json

@@ -2,13 +2,12 @@
   "name": "hugo-wordpress-blog",
   "version": "1.0.0",
   "description": "Hugo static site with WordPress content",
+  "license": "MIT",
   "scripts": {
     "fetch-data": "node scripts/fetch-wordpress.js",
     "generate-content": "node scripts/generate-content.js",
     "prebuild": "npm run fetch-data && npm run generate-content",
-    "build": "npm run build:css && hugo --minify",
     "build:css": "sass assets/css/scss:static/assets/css",
-    "dev": "npm run fetch-data && npm run generate-content && npm run build:css && hugo server -D",
     "clean": "rm -rf data/wordpress content/posts public"
   },
   "dependencies": {
@@ -16,6 +15,7 @@
     "node-fetch": "^3.3.2"
   },
   "devDependencies": {
+    "yarn": "^1.22.22",
     "sass": "^1.69.5"
   }
-}
+}