rsd-admin can add/remove rsd-admin role to other users

[dmijatovic]

Assign rsd admin role

Changes proposed in this pull request:

• RSD admin can assign/remove rsd-role to other rsd users using rsd users page in the administration section  
• Documentation page of rsd users is updated with new animation

How to test:

• make start to build solution and create test data
• login via SURFconext, as professor1 for example
• make professor1 user as rsd-admin via database update (see documentation)
• login via SURFconext as professor3 for example in order to create rsd account for the second user
• login as professor1 again and navigate to adminstration/rsd-users page
• search for professor3 by name Newton
• assign professor3 role of rsd-admin by changing the switch near the name
• login as professor3 and confirm that it has rsd-admin role

Change professor3 to rsd-admin

Cannot change its own role

PR Checklist:

• [ ] Increase version numbers in docker-compose.yml
• [ ] Link to a GitHub issue
• [x] Update documentation
• [ ] Tests

[sonarcloud[bot]]

[rsd-frontend] Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

33.9% Coverage
0.0% Duplication

[ewan-escience]

I did notice one race condition. If two users, both admin, are logged in at the same time in a different browser, they can delete each others admin rights and that way delete the last admin ;-)

You can then create an admin directly in the database again, so I'm ok with this.