feat: update recently read books widget to use image CDN

[chrisvogt]

This PR updates the recently read widgets to use images cached behind my image CDN. It also requests them in a modern web format, webp.

Screenshots

A screenshot of the widget still rendering images.

A screenshot showing the images being returned as webp.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.55%. Comparing base (de36b3e) to head (3edf58e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
+ Coverage   65.00%   65.55%   +0.55%     
==========================================
  Files          64       64              
  Lines         600      601       +1     
  Branches      154      154              
==========================================
+ Hits          390      394       +4     
+ Misses        197      194       -3     
  Partials       13       13              

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[chrisvogt]

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