refactor: update secretariat dashboard style

[rpcross]

No description provided.

[rjsparks]

Please see the failing tests - I think there's a problem around /static/ietf/js/announcement.js

[rjsparks]

Hi @rpcross this seems to have fallen through the cracks?

[jennifer-richards]

Probably should apply Black styling to the Python while you're at it?

[codecov]

Codecov Report

Attention: Patch coverage is 92.15686% with 4 lines in your changes missing coverage. Please review.

Project coverage is 88.81%. Comparing base (35db339) to head (a3bd596).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
ietf/secr/announcement/forms.py	93.75%	2 Missing ⚠️
ietf/secr/announcement/views.py	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8140      +/-   ##
==========================================
- Coverage   88.81%   88.81%   -0.01%     
==========================================
  Files         314      314              
  Lines       41430    41430              
==========================================
- Hits        36795    36794       -1     
- Misses       4635     4636       +1     

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