Revert "fix degre"

This reverts commit 210822f736c04fefa2ab938704ae6775c1fb9df1.

config/env.dev.js

@@ -1,7 +1,6 @@
 module.exports = {
   NODE_ENV: 'development',
-  FILE_UPLOAD: 'gcs',
-  IS_GCS_ENV_PRIORITIZED: true,
+  FILE_UPLOAD: 'mongodb',
   // MONGO_GRIDFS_TOTAL_LIMIT: 10485760,   // 10MB
   MATHJAX: 1,
   // NO_CDN: true,