update folder structure based on style guide

src/app/admin/admin.module.ts

@@ -0,0 +1,45 @@
+import { NgModule } from '@angular/core';
+import { SharedModule } from '../shared/shared.module';
+import { AccessControlModule } from '../access-control/access-control.module';
+import { MetadataImportPageComponent } from './admin-import-metadata-page/metadata-import-page.component';
+import { AdminRegistriesModule } from './admin-registries/admin-registries.module';
+import { AdminRoutingModule } from './admin-routing.module';
+import { AdminCurationTasksComponent } from './admin-curation-tasks/admin-curation-tasks.component';
+import { AdminWorkflowModuleModule } from './admin-workflow-page/admin-workflow.module';
+import { AdminSearchModule } from './admin-search-page/admin-search.module';
+import { AdminSidebarSectionComponent } from './admin-sidebar/admin-sidebar-section/admin-sidebar-section.component';
+import { ExpandableAdminSidebarSectionComponent } from './admin-sidebar/expandable-admin-sidebar-section/expandable-admin-sidebar-section.component';
+
+const ENTRY_COMPONENTS = [
+  // put only entry components that use custom decorator
+  AdminSidebarSectionComponent,
+  ExpandableAdminSidebarSectionComponent,
+];
+
+
+@NgModule({
+  imports: [
+    AdminRoutingModule,
+    AdminRegistriesModule,
+    AccessControlModule,
+    AdminSearchModule.withEntryComponents(),
+    AdminWorkflowModuleModule.withEntryComponents(),
+    SharedModule,
+  ],
+  declarations: [
+    AdminCurationTasksComponent,
+    MetadataImportPageComponent
+  ]
+})
+export class AdminModule {
+  /**
+   * NOTE: this method allows to resolve issue with components that using a custom decorator
+   * which are not loaded during CSR otherwise
+   */
+  static withEntryComponents() {
+    return {
+      ngModule: AdminModule,
+      providers: ENTRY_COMPONENTS.map((component) => ({provide: component}))
+    };
+  }
+}