add announcements model

[Jexsie]

Description of change

Checklist

• npm test passes
• documentation is changed or added (if applicable)
• permission has been obtained to add new logo (if applicable)
• contribution guidelines followed here

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[codecov]

Codecov Report

Attention: Patch coverage is 95.26316% with 9 lines in your changes missing coverage. Please review.

Project coverage is 82.45%. Comparing base (eaf9190) to head (6c8c4ef).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/NavBar/index.tsx	89.65%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #733      +/-   ##
==========================================
+ Coverage   82.36%   82.45%   +0.08%     
==========================================
  Files         145      148       +3     
  Lines       10780    10839      +59     
  Branches      829      838       +9     
==========================================
+ Hits         8879     8937      +58     
- Misses       1901     1902       +1     

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