At User Icon > Backgrounds, the "Hide Locked Backgrounds" switch is on the left of the modal. It should be in the centre:

It would be better to use bcrypt, beause its more secure as it's slower (uses more computing cycles).
Your code could also be better:

You wouldn't need salt field in User model, because it's saved into the same field as password does.

For authentication, something like:

var mongoose = require('mongoose'),
  bcrypt = require('bcryptjs');

var userSchema = mongoose.Schema({
  email: String,

please help me out with deployment of the code in Azure Web App.