feat(demo): add landing page with docs (#1951)

docs/app/pages/pages.module.ts

@@ -0,0 +1,19 @@
+import { NgModule } from '@angular/core';
+
+import { PagesComponent } from './pages.component';
+import { PagesRoutingModule } from './pages-routing.module';
+
+const PAGES_COMPONENTS = [
+  PagesComponent,
+];
+
+@NgModule({
+  imports: [
+    PagesRoutingModule,
+  ],
+  declarations: [
+    ...PAGES_COMPONENTS,
+  ],
+})
+export class PagesModule {
+}