Users module should have more guidance

[joselcvarela]

It looks like the users module is only described in this page: https://directus.io/docs/guides/auth/creating-users

Although, most of the actions are only explained using API calls.

This should be improved by demonstrating how:

• a user can be created
• a user can be invited
• a user status can be changed
• a user can be archived
• a user can be deleted (including a notice that user may not be able to be deleted due to restrictive relationships)
• a user provider can be changed
• a user password can be changed
• a user email can be changed