remove default smtp since Infisical no longer requires SMTP

.env.example

@@ -30,11 +30,11 @@ MONGO_PASSWORD=example
 # Required
 SITE_URL=http://localhost:8080
 
-# Mail/SMTP
- SMTP_HOST='smtp-server'
-SMTP_PORT='1025'
-SMTP_NAME='local'
-SMTP_USERNAME='team@infisical.com'
+# Mail/SMTP 
+SMTP_HOST=
+SMTP_PORT=
+SMTP_NAME=
+SMTP_USERNAME=
 SMTP_PASSWORD=
 
 # Integration