Make env vars more palatable for containerization (#10895)

* refactor(env-vars): remove object/colon syntax

* fix(tests): correct config expectations

website/server/libs/aws.js

@@ -2,6 +2,6 @@ import AWS from 'aws-sdk';
 import nconf from 'nconf';
 
 export const S3 = new AWS.S3({
-  accessKeyId: nconf.get('S3:accessKeyId'),
-  secretAccessKey: nconf.get('S3:secretAccessKey'),
+  accessKeyId: nconf.get('S3_ACCESS_KEY_ID'),
+  secretAccessKey: nconf.get('S3_SECRET_ACCESS_KEY'),
 });