Fixed postinstall script

Author: sanex3339

package.json

@@ -10,7 +10,7 @@
     "stop": "pm2 delete ecosystem.config.js",
     "webpack:dev": "webpack --mode development --config webpack.conf.js --watch --color --progress",
     "webpack:prod": "NODE_ENV=production webpack --mode production --config webpack.conf.js --devtool source-map --progress --optimize-minimize",
-    "postinstall": "npm run updatesemantic",
+    "postinstall": "npm run updatesemantic && npm run webpack:prod",
     "updatesemantic": "cp App/styles/theme.config ./node_modules/semantic-ui-less/theme.config; rm -Rf ./node_modules/semantic-ui-less/site; cp -R App/styles/site ./node_modules/semantic-ui-less/"
   },
   "author": "",