Improvements for the printable version

• Don't underline *all* the links ever
  • In printable view, [https://foo.example.com/Bar Asdfqwerty] gets rendered as "Asdfqwerty (https://foo.example.com/Bar)"; previously the "Asdfqwerty" part as well would be underlined, now it isn't *but* the space between "Asdfqwerty" and the URL kinda...is underlined (TODO: how to make it not underlined?)
• Hide the "This page was last edited..." text, not relevant for a printed page IMHO
• Hide powered by MediaWiki icon + the copyright icon (if any); again, not relevant

Change-Id: Ia37cb1971cd8cafb5e07acb48f30e21afc68b14d