build scripts updated

package.json

@@ -5,7 +5,9 @@
     "description": "",
     "scripts": {
         "start": "next dev",
-        "build": "next build && next export -o dist && npm run sitemap && npm run feed",
+        "build": "npm run next-build && npm run export && npm run sitemap && npm run feed",
+        "next-build": "next build",
+        "export": "next export -o dist",
         "sitemap": "node scripts/sitemap.js",
         "feed": "node scripts/feed.js",
         "test": "mocha --compilers js:babel-register"