Add RBAC chapters to the User module tutorial (#1755)

* Add RBAC chapters to the User module tutorial

* Add Authorizatuon commands chapter and draft Assigning roles chapter

* Add Assigning roles to Users chapter

* Add Displaying the Admin link based on permissions and tutorials page

* Add Tutorials menu point

* add navigation

* fix path to images

* Apply suggestions from code review

Co-authored-by: Maciej Krajowski-Kukiel <[email protected]>

* Fix wrong navigation leading to Roles and Permissions

* Rewrite tutorial without pos-cli init and minor fixes

* Fix navigation

* Update app/views/pages/tutorials/user-management/authentication-flow.liquid

* Clarify message about missing admin endpoint

Removed unnecessary wording for clarity.

* Update pronoun for user role assignment instructions

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Co-authored-by: Maciej Krajowski-Kukiel <[email protected]>

Author: simplykatsa