Draft: Hide sensitive value of SMTP settings
Currently, the SMTP password is sent to the frontend and managed as a plaintext setting in the backend. Let's treat it as a secret and return “***” to the frontend, when the password field is unchanged in the form don't send it to the backend.
I also added a Dockerfile for local development and documented in the docs, hope it is useful :)
EDIT: marked as draft since I didn't test backward compatibility
Edited by pinguino