switch to new routing method

should help with future implementations

frontend/src/app/routes/pagenotfound/processing.routing.module.ts

@@ -0,0 +1,16 @@
+import { NgModule } from '@angular/core';
+import { RouterModule, Routes } from '@angular/router';
+import { PageNotFoundComponent } from './pagenotfound.component';
+
+const routes: Routes = [
+  {
+    path: 'pagenotfound',
+    component: PageNotFoundComponent,
+  },
+];
+
+@NgModule({
+  imports: [RouterModule.forChild(routes)],
+  exports: [RouterModule],
+})
+export class PageNotFoundRoutingModule {}