Hide iFixit.com's footer in webviews

Amazon rejected our latest build of the app because they could get to links
through the web view to other app stores.  Rather than trying to fix it, we're
just going to hide the footer because that's easier and it doesn't really
matter if we have the footer in the apps webview (it's just answers)
Only hide the footer on ifixit
Merge pull request #181 from iFixit/hide-webview-footer-for-amazon-appstore

Hide webview footer for amazon appstore