✨ add new config variable "defaultWidths"

[JulianNymark]

What and Why?

Allow default widths to be set to something other than "show all the widths available", since we support a lot of breakpoints, but for the average developer using our design system it's a bit overwhelming to see all of them + horizontal scroll when they are usually just interested in one or two breakpoints (for us it's usually a mobile width + generic desktop widths).

How?

introduces a configuration variable defaultWidths that becomes the viewports rendered when you have no width check mark selected in the sidebar (as shown in the screenshot above).

module.exports = {
  // ...
  widths: [320, 480, 768, 1024, 1280, 1440],
  defaultWidths: [320, 1280]
};

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[michaeltaranto]

Addressed by #305