Update default behavior to production environment settings

Author: alexisbcc

.env.example

@@ -1,4 +1,4 @@
 TWILIO_ACCOUNT_SID=ACxxxxxxxxxxxxx
 TWILIO_AUTH_TOKEN=Your-Twilio-Auth-Token
 TWILIO_NUMBER=+1707XXXXXXX
-NODE_ENV=development
+NODE_ENV=production

app.js

@@ -29,33 +29,14 @@ app.use((req, res, next) => {
 
 app.use('/', MessagingRouter());
 
-/**
- * Error handlers
- */
-
-/**
- * development error handler
- * will print stacktrace
- */
-if (app.get('env') === 'development') {
-  // eslint-disable-next-line no-unused-vars
-  app.use((err, req, res, next) => {
-    res.status(err.status || 500);
-    res.render('error', {
-      message: err.message,
-      error: err,
-    });
-  });
-}
-
 /**
  * production error handler
  * no stacktraces leaked to user
  */
 // eslint-disable-next-line no-unused-vars
 app.use((err, req, res, next) => {
   res.status(err.status || 500);
-  res.render('error', {
+  res.send({
     message: err.message,
     error: {},
   });