update yarn.lock and add PUBLIC_URL to build script

Author: shoudaos

package.json

@@ -3,7 +3,7 @@
   "version": "5.0.1",
   "private": true,
   "scripts": {
-    "build": "REACT_APP_BACKEND=true node scripts/build.js",
+    "build": "REACT_APP_BACKEND=true PUBLIC_URL='/light-blue-react' node scripts/build.js",
     "start": "node scripts/start.js",
     "start:backend": "REACT_APP_BACKEND=true node scripts/start.js",
     "test": "node scripts/test.js"