* Trying out a tooltip alternative for combined graph in new dashboard

refs: TryGhost/Team#1467

* Trying out a different type of interaction with the combined graph for the new dashboard that includes different style

refs: TryGhost/Team#1467

* Working through the interface and code to majorly clean up for the new Dashboard

refs: TryGhost/Team#1462

- lots of moving around css
- trying out some different layouts
- refactoring lots of code
- known bug: paid graphs don't work
- known bug: without newsletters, layout breaks

* Finishing up the basic styling of the new dashboard to be more presentable

refs: TryGhost/Team#1462

- add an animation between the top metrics on combined graph
- ensure all graphs are responsive to parent container
- refactor many of the components and tidy up the styles
- tighten up spacing, headers, chart heights and more
- make the tooltip hovers a little more presentable
- balance the colors to be more muted, for the moment
- a million other tiny tweaks