QA: Rewrite tests for main menu navigation and footer links

* Kill HomePage, moving reusable components to ArticlePage
* Rewrite footer.feature to be a more generic UI component checklist
to ensure we do not accidentally disable the history link or license
link

Change-Id: I7703d15d9fde274f9066c01612a82c8eb86b69da
Merge "QA: Rewrite tests for main menu navigation and footer links"