OZG-106 add vorgang-detail-header styling

.../ui/src/lib/ui/subnavigation/subnavigation.component.scss

goofy-client/libs/ui/src/lib/ui/ui.module.ts

...ent/libs/ui/src/lib/ui/user-icon/user-icon.component.html

...ent/libs/ui/src/lib/ui/user-icon/user-icon.component.scss

.../libs/ui/src/lib/ui/user-icon/user-icon.component.spec.ts

...lient/libs/ui/src/lib/ui/user-icon/user-icon.component.ts

...-detail-container/vorgang-detail-container.component.html

...organg-detail-header/vorgang-detail-header.component.html

...organg-detail-header/vorgang-detail-header.component.scss

.../vorgang-detail-header/vorgang-detail-header.component.ts