refs: https://github.com/TryGhost/Team/issues/1531
- broke apart the combined chart
- added back in the paid mix chart
- separated out the mini charts into separate components
- made top chart work with total, paid and free
- added in an overview section back at the top for total, paid, free
- made metric labels and values larger and easier to parse
Co-authored-by: Simon Backx <simon@ghost.org>
