Add charts showing total activities over past seven days on Homes page

> As a manager
> I would like to see total activity counts within the past seven days on the Homes page
> so I can directly compare the activities conducted in each home

# Task
- [ ] Design and implement a way to allow direct comparison of activity counts across homes
- it may need to take into account the differing number of residents (to make comparison balanced)

No files or tests are named. Start by locating the Homes page and any existing activity visualizations, then determine how activity counts and resident totals are represented; done means managers can compare each home's past-seven-day activity counts with a clearly defined resident-balanced presentation.

Written by the indexing model from the issue text.