Move ng-app property to html element

I also fixed the html tags in the conditional comments at the top. The
opening and closing html tags are inserted manually now.

The ng-app property is left out for IE8 and below. I don't need to
enable IE8 users to edit articles on this default site. All the Angular
app will do for IE8 users is make the URLs ugly, add strange delays
under some circumstances and break links within the page.

For business to business software, even IE8 users need to be able to log
in and edit. In that case, I will just have to put up with the
crustiness. If there are public-facing URLs that I really want to keep
clean, I can put them under a different prefix without an Angular app.