doc(angular): replaceable components

docs/en/Angular/ReplaceableComponents/index.md

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+## Replaceable Components
+
+There is a list of components that you can replace at runtime.
+
+Create a new component that you want to use instead of the ABP component. Add that component to `declarations` and `entryComponents` in the `AppModule`.
+
+Then, open the `app.component.ts` and dispatch the `AddReplaceableComponent` action to replace your component with an ABP component as shown below:
+
+```ts
+import { ..., AddReplaceableComponent } from '@abp/ng.core';
+export class AppComponent implements OnInit {
+  constructor(..., private store: Store) {}
+
+  ngOnInit() {
+    this.store.dispatch(
+      new AddReplaceableComponent({
+        component: YourNewRoleComponent,
+        key: 'Identity.RolesComponent',
+      }),
+    );
+    //...
+  }
+}
+```
+
+An example:
+![Example Usage](./images/inaction.gif)
+
+> You can use `getAll` and `getComponent('Component Key')` selectors to get all replaceable components or just one of them by key.
+
+### Available Replaceable Components
+
+| Component key                                      | Description                      |
+| -------------------------------------------------- | -------------------------------- |
+| Account.LoginComponent                             | Login page                       |
+| Account.RegisterComponent                          | Register page                    |
+| Account.ManageProfileComponent                     | Manage Profile page              |
+| Account.ForgotPasswordComponent                    | Forgot password page             |
+| Account.ResetPasswordComponent                     | Reset password page              |
+| Account.AccountComponent                           | The component that wraps register, login, forgot password, and reset password pages. Contains `<router-outlet>`                   |
+| Account.ChangePasswordComponent                    | Change password form in manage profile page                                                                                    |
+| Account.PersonalSettingsComponent                  | Personal settings form in manage profile page                                                                                    |
+| Account.TenantBoxComponent                         | Tenant changing box in account component                                                                               |
+| AuditLogging.AuditLogsComponent                    | Audit logs page                  |
+| Identity.UsersComponent                            | Users page                       |
+| Identity.RolesComponent                            | Roles page                       |
+| Identity.ClaimsComponent                           | Claim types page                 |
+| IdentityServer.IdentityResource                    | Identity resources page          |
+| IdentityServer.Client                              | Clients page                     |
+| IdentityServer.ApiResource                         | Api resources page               |
+| LanguageManagement.Languages                       | Languages page                   |
+| LanguageManagement.LanguageTexts                   | Language texts page              |
+| Saas.TenantsComponent                              | Tenants page                     |
+| Saas.EditionsComponent	                         | Editions page                    |
+| FeatureManagement.FeatureManagementComponent       | Features modal                   |
+| PermissionManagement.PermissionManagementComponent | Permissions modal                |
+| SettingManagement.SettingManagementComponent       | Setting Management page          |