Design & Copy nits

[mdo]

• Modify padding of row expanding
• Modify spacing between snippet and expander
• Add bottom padding to file for split diff example
• Fix banding in the angle pattern—this could be a repeating gradient issue, I'm assuming
• Touch up arbitrary files section of docs
• Fix language in with love section
• Put an example high up in the page for the docs
• Finalize vibrant P3 color themes, apply to docs
• Add new icon for no change (is this ignored?) Changed NC to No diff
• Remove transition on dropdown menus, leads to weird hovers; fix dropdown alignment

[amadeus]

@mdo realizing this bug Add bottom padding to file for split diff example happens when you are using wrapped code, so I need to figure out probably a solution for this.

I'll do it in my #72 branch