Add a way to pause the background animation #220

I currently set href to "" because I don't currently know how to interface with session variables directly through html tags. "Basic View" and "Standard View" have different lengths, so the footer shifts when the button is pressed. The paused background state is different from the paused state when the user once again switches to the tab after a period of time, where the triangles are all orange and regular. The session variable can also be renamed and used elsewhere to perhaps make the page less reactive, for example in displaying search results, to reduce lag.
> Because now, to me it seems both render (in Background) and draw (in Background) call draw (in Background).

No, they call `frame` and pass `@draw` as an argument.

> I still don’t see why there seems to be redundancy here

One bootstraps the loop, the other continues the loop.

> nor how time is passed into draw

You should check what `frame` does.

> And to confirm I should call Background.render again when the background is resumed

Not necessary. That would restart whole image and you would have a jump in positions of triangles.

> Does it have to be removed

What exactly do you think "it" is here? What is appended?