[feature request] improve small screen support

[greaterweb]

It would be great if the style guide had support for small screens (responsive) out of the box. I'm sure most would anticipate the average user to be reviewing the style guide from a desktop, it would be great though to have some better responsive support for smaller devices by default.

The last one for the night, promise! Again, great work on nucleus. I'm really looking forward to seeing future improvements to the tool.