Update package.json to handle fatal error on build

As per here: https://stackoverflow.com/questions/55613789/how-to-fix-fatal-error-ineffective-mark-compacts-near-heap-limit-allocation-fa

package.json

@@ -27,8 +27,8 @@
     "rxjs": "^6.5.3"
   },
   "scripts": {
-    "start": "react-scripts start",
-    "build": "react-scripts build",
+    "start": "react-scripts --max_old_space_size=4096 start",
+    "build": "react-scripts --max_old_space_size=4096 build",
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject"
   },