[examples][frameworks] Add missing examples and add a test to ensure every framework has an example (#4372)

* Add test to frameworks

* Add example for Docusaurus v2

* Add example for ionic-angular

* Update READMEs

* Use existing versions

* Reset yarn.lock

* Add schema validation and add missing Scully.io logo

examples/ionic-angular/e2e/src/app.e2e-spec.ts

@@ -0,0 +1,24 @@
+import { AppPage } from './app.po';
+
+describe('new App', () => {
+  let page: AppPage;
+
+  beforeEach(() => {
+    page = new AppPage();
+  });
+
+  it('should display the menu', () => {
+    page.navigateTo();
+    expect(page.getMenu()).toBeTruthy();
+  });
+
+  it('should get the slides text', () => {
+    page.navigateTo();
+    expect(page.getFirstSlide()).toBe('ion-slide');
+  });
+
+  it('should create a router outlet', () => {
+    page.navigateTo();
+    expect(page.getRouter()).toBeTruthy();
+  });
+});