Deploy should add how to create user and connection

[bohutang]

Summary

https://databend.rs/doc/deploy/deploying-databend#verifying-deployment

We don't let users use the root account, root is only used for localhost, we should guide them to create a new user and connect.

[bohutang]

cc @soyeric128

[rahul3002]

If this issue is open, I'd love to tackle it head-on!

[PsiACE]

If this issue is open, I'd love to tackle it head-on!

https://databend.rs/doc/deploy/deploying-databend

We have added relevant content to the document and thank you for your interest in it.