Refactor data fetching to use browser timezone, remove server rendering

[benvinegar]

Fixes #109 and #107

This is a major change that removes all server-side rendered React, so that the app can first inspect the user's browser timezone, and pass that along to every component.

By doing so, we avoid having to use Cloudflare Worker's cf.timezone property, which can create confusing scenarios (like #107) when the user's internet doesn't route through the timezone they're located in (e.g. when using a VPN or proxy).

[codecov]

Codecov Report

Attention: Patch coverage is 72.05882% with 95 lines in your changes missing coverage. Please review.

Project coverage is 77.66%. Comparing base (56518f8) to head (870bc1a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/lib/utils.ts	41.53%	38 Missing ⚠️
app/routes/resources.timeseries.tsx	67.32%	33 Missing ⚠️
app/routes/resources.stats.tsx	83.14%	15 Missing ⚠️
app/components/TimeSeriesChart.tsx	18.18%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
- Coverage   80.26%   77.66%   -2.61%     
==========================================
  Files          29       31       +2     
  Lines        2954     3138     +184     
  Branches      201      217      +16     
==========================================
+ Hits         2371     2437      +66     
- Misses        575      693     +118     
  Partials        8        8              

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