fix(admin) : fix admin module structure

src/app/admin/admin.module.ts

 import { NgModule } from '@angular/core';
 import { CommonModule } from '@angular/common';
-import { PanelComponent } from './panel/panel.component';
-import { ValidationAttachmentComponent } from './validation-attachment/validation-attachment.component';
+import { PanelComponent } from './components/panel/panel.component';
+import { ValidationAttachmentComponent } from './components/validation-attachment/validation-attachment.component';
 import { SharedModule } from '../shared/shared.module';
 
 @NgModule({

src/app/app-routing.module.ts

 import { NgModule } from '@angular/core';
 import { Routes, RouterModule } from '@angular/router';
 import { AboutComponent } from './about/about.component';
-import { PanelComponent } from './admin/panel/panel.component';
+import { PanelComponent } from './admin/components/panel/panel.component';
 import { AdminGuard } from './guards/admin.guard';
 import { AuthGuard } from './guards/auth.guard';
 import { HomeComponent } from './home/home.component';