Create User Management

[SilvanBaach]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like Create a page where the user can edit all users and manage registration codes:

• Display a Table where all users are shown (Max 10 entries per page) and an edit button
• If the user clicks the edit button a new box should pup up on the right where he can change data
• Display a Table with all registration codes which have the expiration date passed < 7 Days
• The user should be able to create new codes
• The user should be able to activate disabled codes
• The user should be able to deactivate active codes

Describe alternatives you've considered

Additional context

[SilvanBaach]

Please add the following feature:

-Admins should be able to Block / unblock users -The field loginattempts should not be displayed -Make something like a "Blocked State" which can be toggeled in the GUI. Make Red and Green Circles to indicate if the user is blocked or not.

[jaypi95]

Please correctly add PRs to their corresponding issue in the future so they get automatically closed.