Fixed the cat gif url, and tried to make the newtab page a little better.

Now we bundle the newtab.css files, so that you can see the old styles everywhere!

* Include a whimsical saying in the newtab's title.
* Don't auto-focus the DDG searchbar.
* Add a right-click menu to copy the gif's thumbnail!

It's a WebExtension now!!!

On the down-side, a lot of the things it used to do are no longer possible. On the up side, it'll work on Firefox 57+. ¯\_(ツ)_/¯

I'm hoping to re-add what I can, but in the meantime, please feel free to leave comments letting me know what you miss most.

One final thing: The vast majority of the work to make this possible was done by my intern, Daniela Arcese. Seriously, I spent about an hour, total, on it. So any thanks should go her way. (Complaints, as always, can be directed to me.