Registration with keycloak #3

[longshuicy]

To test:

1. import new realm definition and double check if 1) registraion is enabled in keycloak and 2) the redirect URL is correct
   realm-export-latest.json.zip

2. Either go to http://localhost:3000/auth/logout and find "register" on the topbar; or directly go to http://localhost:3000/auth/register endpoint to register

4. You can also test registration by going to keycloak's login page and click "new user? register"

Note: I also fixed the "name" null null error on each dataset/file/folders

[lmarini]

Can you update the keycloak configuration under /keycloak/realm-export.json?