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.
Don't encode strings into code, if they could be in the template. Here you could just expose the session variable value and then in the template decide how to format that.

For user-facing strings we use `"`, for constants we use `'`'. Read our code style.