add support for dynamic blog banner generation

[gdams]

Description of change

Automatically generates social blog banners like this:

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 91.41531% with 37 lines in your changes missing coverage. Please review.

Project coverage is 80.10%. Comparing base (23fa1f5) to head (e3e60f1).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/News/RelatedArticles/index.tsx	0.00%	21 Missing ⚠️
...onents/News/RelatedArticles/RelatedArticleCard.tsx	0.00%	10 Missing ⚠️
src/util/generateFeaturedImage.tsx	98.27%	2 Missing ⚠️
src/components/Events/EventCard/index.tsx	83.33%	1 Missing ⚠️
src/components/News/NewsCardList/index.tsx	97.29%	1 Missing ⚠️
src/templates/newsPost.tsx	83.33%	1 Missing ⚠️
src/templates/tagPage.tsx	96.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #764      +/-   ##
==========================================
+ Coverage   79.80%   80.10%   +0.29%     
==========================================
  Files         152      153       +1     
  Lines       11334    11548     +214     
  Branches      826      855      +29     
==========================================
+ Hits         9045     9250     +205     
- Misses       2289     2298       +9     

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