Add first version of "who is using g-cloud" graph
Move popover related Sass into a single file

Use mixins to include it in multiple places.
Reorganise index.scss into logical groups

Also rename module_actions to module_more_info for ease of scanning.
Add first version of "who is using g-cloud" graph
Fix typos missed during rebase
Change graph order to match design
Use hyphens, not underscores, consistently in Stagecraft slugs
Ensure all applicable parameters are passed in Backdrop stub response
Remove blank line
Rename "g-cloud" to "gcloud" in Stagecraft stubs, to match Backdrop service
Merge with master
Merge
Update with latest Backdrop data; update Stagecraft stub; amend line labels
Merge with master
Remove problematic final month from data
Update slug for page-per-thing
Add currency to page-per-thing
Ensure page-per-thing matches main dashboard
Remove problematic final month data from Backdrop stub
Add "Unknown" series on who-is-using graph