Improved mocked state generator for dashboard 5.0
Improved mocked state generator for dashboard 5.0

refs https://github.com/TryGhost/Team/issues/1489

- Apart from newer sites (state with days < 30) the MRR will start to deviate from the paid members graph. This will normally also be the case for real sites.
- All graphs will be zeroed out if state 'no data' is selected.
- The generator is a bit too complex to make this happen. It was some trial and error, but doesn't matter that much since we'll nuke this code once 5.0 is out.

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