* clean up activity serailizer
* fix line chart so only plot months with data
* cleanup monthly serializer
* account for empty months in vertical bar chart
* tidy version upgrade info
* fix version history model typo
* extract const into helper
* add upgrade indicator to line chart
* fix tests
* add todos
* adds serializer
* removes all 1.11 related work to monthly/new client counting
* move from new-init-activity to activity
* merge setup changes add monthly model/adapter
* delete new-init-activity files
* add graph to current month view