Consider to generalize building admin ui forms with jsonschema

[janus-reith]

It could be worthwhile to evaluate wether a solution like https://github.com/vazco/uniforms or https://github.com/rjsf-team/react-jsonschema-form could be used in the admin ui to reduce the complexity that has to be managed here, and maybe also speeds up + reduces size of the prime react kit library implementation, if that is still relevant.