refactor(docs-infra): remove unused styleguide examples (angular#38143)

The `03-*` code style rule have been removed from the style guide in
be0bc79.

This commit removes the corresponding files and related unused code from
the`styleguide` example project.

PR Close angular#38143

Author: gkalpak

aio/content/examples/styleguide/e2e/src/app.e2e-spec.ts

@@ -29,50 +29,6 @@ describe('Style Guide', function () {
     expect(input.isPresent()).toBe(true);
   });
 
-  it('03-01', function () {
-    browser.get('#/03-01');
-
-    let div = element(by.tagName('sg-app > div'));
-    expect(div.getText()).toBe('The expected error is 42');
-  });
-
-  it('03-02', function () {
-    browser.get('#/03-02');
-
-    let divs = element.all(by.tagName('sg-app > div'));
-    expect(divs.get(0).getText()).toBe('Heroes url: api/heroes');
-    expect(divs.get(1).getText()).toBe('Villains url: api/villains');
-  });
-
-  it('03-03', function () {
-    browser.get('#/03-03');
-
-    let div = element(by.tagName('sg-app > div'));
-    expect(div.getText()).toBe('Our hero is RubberMan and He is so elastic');
-  });
-
-  it('03-04', function () {
-    browser.get('#/03-04');
-
-    let buttons = element.all(by.tagName('sg-app > button'));
-    expect(buttons.get(0).getText()).toBe('Show toast');
-    expect(buttons.get(1).getText()).toBe('Hide toast');
-  });
-
-  // temporarily disabled because of a weird issue when used with rxjs v6 with rxjs-compat
-  xit('03-06', function () {
-    browser.get('#/03-06');
-
-    let div = element(by.tagName('sg-app > div'));
-    expect(div.getText()).toBe('Actual favorite: Windstorm');
-
-    let lis = element.all(by.tagName('sg-app > ul > li'));
-    expect(lis.get(0).getText()).toBe('Windstorm');
-    expect(lis.get(1).getText()).toBe('Bombasto');
-    expect(lis.get(2).getText()).toBe('Magneta');
-    expect(lis.get(3).getText()).toBe('Tornado');
-  });
-
   it('04-10', function () {
     browser.get('#/04-10');