Feature: Focus/Demo Mode

[nwittwer]

Sometimes you just want to focus on a certain screen size—this can be while developing or during a demo.

• [ ] Separate area/page, with only one artboard
• [ ] Easily switch between sizes
• [ ] Toggle "disco mode" to switch between sizes automatically
  • [ ] Enable "random" to switch between random screen sizes to discover issues
• [ ] Toggle "layout debugger" to show DOM as boxes
• [ ] Docked/embedded Devtools