chore(grids): update grid debugger
chore(grids): update grid debugger

- Annotate body size for mobile and extra large screens
- Use defined breakpoint values rather than hardcoded values for media
  queries

[Finishes #81277240]

Signed-off-by: Geoff Pleiss <9875a3586c9e5c98a1a53f88b416459dcaffc47c@pivotal.io>

CanopyCloud/pivotal-ui,npm/pivotal-ui,pivotal-cf/pivotal-ui,pivotal-cf/pivotal-ui,sjolicoeur/pivotal-ui,sjolicoeur/pivotal-ui,npm/pivotal-ui,sjolicoeur/pivotal-ui,sjolicoeur/pivotal-ui,CanopyCloud/pivotal-ui,pivotal-cf/pivotal-ui,CanopyCloud/pivotal-ui,npm/pivotal-ui