OZG-6242 Add ghost variant

...wizard-container/bescheid-wizard-container.component.html

...nent/src/lib/download-button/download-button.component.ts

...ent/libs/design-system/src/lib/button/button.component.ts

...lient/libs/design-system/src/lib/button/button.stories.ts

...elle-button/edit-zustaendige-stelle-button.component.html

...le-dialog/search-zustaendige-stelle-dialog.component.html