Add visitors + bounce rate to timeseries chart

[benvinegar]

Now that bounce data is available via #116, decided to add this and visitors to the timeseries chart.

Screenshot:

[codecov]

Codecov Report

Attention: Patch coverage is 89.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 81.23%. Comparing base (1bd9b16) to head (a8d3148).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/analytics/query.ts	66.66%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
+ Coverage   81.20%   81.23%   +0.03%     
==========================================
  Files          32       32              
  Lines        2293     2329      +36     
  Branches      253      255       +2     
==========================================
+ Hits         1862     1892      +30     
- Misses        423      429       +6     
  Partials        8        8              

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