docs: remove unused examples and images (#28597)

PR Close #28597

.github/CODEOWNERS

@@ -495,12 +495,9 @@
 /aio/content/images/guide/lifecycle-hooks/**                    @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 
 /aio/content/examples/ngcontainer/**                            @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
-/aio/content/images/guide/ngcontainer/**                        @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 
 /aio/content/guide/ngmodules.md                                 @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/examples/ngmodules/**                              @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
-/aio/content/examples/ngmodule/**                               @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
-/aio/content/images/guide/ngmodule/**                           @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 
 /aio/content/guide/ngmodule-api.md                              @angular/fw-core @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 
@@ -762,11 +759,9 @@ testing/**                                                      @angular/fw-test
 
 /aio/content/guide/observables.md                               @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/examples/observables/**                            @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
-/aio/content/images/guide/observables/**                        @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/guide/comparing-observables.md                     @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/guide/observables-in-angular.md                    @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/examples/observables-in-angular/**                 @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
-/aio/content/images/guide/observables-in-angular/**             @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/guide/practical-observable-usage.md                @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/examples/practical-observable-usage/**             @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/guide/rx-library.md                                @angular/fw-docs-observables @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
@@ -782,7 +777,6 @@ testing/**                                                      @angular/fw-test
 /aio/content/guide/browser-support.md                           @angular/fw-docs-packaging @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/guide/typescript-configuration.md                  @angular/fw-docs-packaging @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/examples/quickstart/**                             @angular/fw-docs-packaging @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
-/aio/content/guide/setup-systemjs-anatomy.md                    @angular/fw-docs-packaging @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/guide/setup.md                                     @angular/fw-docs-packaging @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/examples/setup/**                                  @angular/fw-docs-packaging @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes
 /aio/content/guide/build.md                                     @angular/fw-docs-packaging @angular/framework-global-approvers @angular/framework-global-approvers-for-docs-only-changes

aio/content/examples/property-binding/src/app/app.component.ts

@@ -1,30 +0,0 @@
-import { Component } from '@angular/core';
-
-
-@Component({
-  selector: 'app-root',
-  templateUrl: './app.component.html',
-  styleUrls: ['./app.component.css']
-})
-export class AppComponent {
-  itemImageUrl = '../assets/lamp.png';
-  isUnchanged = true;
-  classes = 'special';
-  // #docregion parent-data-type
-  parentItem = 'bananas';
-  // #enddocregion parent-data-type
-
-  // #docregion pass-object
-  currentItem = [{
-    id: 21,
-    name: 'peaches'
-  }];
-  // #enddocregion pass-object
-
-  interpolationTitle = 'Interpolation';
-  propertyTitle = 'Property binding';
-
-  // #docregion malicious-content
-  evilTitle = 'Template <script>alert("evil never sleeps")</script>Syntax';
-  // #enddocregion malicious-content
-}

aio/content/guide/template-syntax.md

@@ -956,7 +956,7 @@ The following event binding listens for the button's click events, calling
 the component's `onSave()` method whenever a click occurs:
 
 <figure>
-  <img src='generated/images/guide/event-binding/syntax-diagram.svg' alt="Syntax diagram">
+  <img src='generated/images/guide/template-syntax/syntax-diagram.svg' alt="Syntax diagram">
 </figure>
 
 ### Target event