Update config variables and add nodemailer's ones

config/config.js

@@ -1,7 +1,13 @@
 module.exports = {
-	jwt_secret: process.env.JWT_SECRET,
+	// from '.env' in root folder
 	port: process.env.PORT || 3001,
-	db_url: process.env.DATABASE_URL,
 	environment: process.env.NODE_ENV || 'development',
+	dbURL: process.env.DATABASE_URL,
+	jwtSecret: process.env.JWT_SECRET,
+	smtpHost: process.env.SMTP_HOST,
+	smtpPort: process.env.SMTP_PORT,
+	smtpUsername: process.env.SMTP_USERNAME,
+	smtpPassword: process.env.SMTP_PASSWORD,
+	// Others
 	saltingRounds: process.env.SALTING_ROUNDS || 10,
 };