UI

[cptKNJO]

This PR adds the following features:

• List users in a table
  • Add button to remove a user
  • Add page to add a new admin user. Should have a field for name, password and repeat password. (Before creating new user on server we validate if the entered passwords are identical.)
• Authenticated routes
• Cleaned up some technical debt (styles, optimization, routes handling)

Screenshots

User management page

Empty user form

Validations

Validate no user with duplicate username is created

Password validation

Prevent removing the last admin when another non-admin user exists

Display clear messages on banner for failures and successful creation/removal of users

[uroni]

Looks good! Thx!