refactor: remove over-write of environment variables in configuration.js

src/config/index.js

@@ -1,6 +1,3 @@
-import { mergeConfig } from '@edx/frontend-platform';
-import envConfig from 'env.config';
-
 const configuration = {
   // BASE_URL: process.env.BASE_URL,
   LMS_BASE_URL: process.env.LMS_BASE_URL,
@@ -23,9 +20,6 @@ const configuration = {
   ENABLE_EDX_PERSONAL_DASHBOARD: process.env.ENABLE_EDX_PERSONAL_DASHBOARD === 'true',
 };
 
-// This mergeConfig ensures that any variables assigned by process.env are still overwritten if declared in JS config
-mergeConfig(envConfig);
-
 const features = {};
 
 export { configuration, features };