Add submit button component and style it.

frontend/src/app/core/rest-services/publications/publication.rest-service.ts

@@ -16,4 +16,8 @@ export class PublicationRestService {
   getById(publicationId: string): Promise<Publication> {
     return lastValueFrom(this.httpClient.get<Publication>(`/api/publications/${publicationId}`));
   }
+
+  update(publication: Publication): Promise<void> {
+    return lastValueFrom(this.httpClient.put<void>(`/api/publications/${publication.id}`, publication));
+  }
 }