Bug 1022224 - [testing] Add css locators to page elements

Added some of the needed css selectors for selecting elements in functional tests.
I'm not sure about these two. I'm not really sure what rules one is supposed to follow for id's but this looks unusual. I would imagine it with both of these being assigned an id of `get-started`, because only one will ever be present at a time, and then the locator could use the `disabled` attribute to distinguish between them, or even the code could simply get the element with the id of `get-started` and then the page object could determine if it is disabled or not.