feat: Agenda URL #hash scrolls to 'now' or specific day

[holloway]

Fixes #7245

Allows scrolling to either #now or #agenda-day-YYYY-MM-DD on page load.

Adds a developer-only utility to modify server agenda dates to be the same as local browser time, so that the 'Now' button is available.

[holloway]

Removed so that when clicking 'Now' <a href="#now">Now</a>

...it will update the browser location with #now so that future reloads will have a hashstate that expresses 'Now'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.79%. Comparing base (c7f6bde) to head (56f29b2).
Report is 47 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7772      +/-   ##
==========================================
+ Coverage   88.78%   88.79%   +0.01%     
==========================================
  Files         296      303       +7     
  Lines       41320    41422     +102     
==========================================
+ Hits        36687    36782      +95     
- Misses       4633     4640       +7     

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[rjsparks]

This is looking good on desktop, but on screens the size of an iphone 11, its not acting as intended. With the dev code uncommented, looking in this view, the now link doesn't change what's in the url bar, and pasting http://localhost:8000/meeting/agenda/#now into a blank tab doesn't cause the viewport to move to the red line.

[holloway]

@rjsparks the functionality should work now. I still need to fix the tests.

[holloway]

@rjsparks fixed. ready for review