Fixed issue where container was too narrow

I felt like the container looked too narrow on my 1920x1200 display,
and found it was at 730px which seemed wrong. I found this code that
was setting the container's max width to 730px. Once I removed this,
the container was able to size to 970px like it's supposed to.

If this is totally wrong, feel free to reject. But I find it weird that when I size my browser up past 768px, I'm watching the styles live in Firefox inspector, and I see this become active:

    .container {
      width: 790px;
    }

But this is also active, thus limiting the width:

    .container {
      max-width: 730px;
    }