feat(doc): move pipe intermediate

apps/angular/pipe-intermediate/src/main.ts

@@ -0,0 +1,10 @@
+import { enableProdMode } from '@angular/core';
+import { bootstrapApplication } from '@angular/platform-browser';
+import { AppComponent } from './app/app.component';
+import { environment } from './environments/environment';
+
+if (environment.production) {
+  enableProdMode();
+}
+
+bootstrapApplication(AppComponent).catch((err) => console.error(err));