feat(aio): include more API results in search

By adding a more relaxed search on the title
of docs, we are more likely to catch API docs.

The additional search terms match anything
with a word in the title that starts with the
characters of the first term in the search.

E.g. if the search is "ngCont guide" then
search for "ngCont guide titleWords:ngCont*"

aio/e2e/app.e2e-spec.ts

@@ -92,4 +92,10 @@ describe('site App', function() {
     // Todo: add test to confirm tracking URL when navigate.
   });
 
+  describe('search', () => {
+    it('should find pages when searching by a partial word in the title', () => {
+      page.enterSearch('ngCont');
+      expect(page.getSearchResults().map(link => link.getText())).toContain('NgControl');
+    });
+  });
 });

aio/e2e/app.po.ts

@@ -1,4 +1,4 @@
-import { browser, element, by, promise, ElementFinder } from 'protractor';
+import { browser, element, by, promise, ElementFinder, ExpectedConditions } from 'protractor';
 
 const githubRegex = /https:\/\/github.com\/angular\/angular\//;
 
@@ -50,6 +50,16 @@ export class SitePage {
     return browser.executeScript('window.scrollTo(0, document.body.scrollHeight)');
   }
 
+  enterSearch(query: string) {
+    element(by.css('.search-container input[type=search]')).sendKeys(query);
+  }
+
+  getSearchResults() {
+    const results = element.all(by.css('.search-results li'));
+    browser.wait(ExpectedConditions.presenceOf(results.first()), 8000);
+    return results;
+  }
+
   /**
    * Replace the ambient Google Analytics tracker with homebrew spy
    * don't send commands to GA during e2e testing!