Cache public resource rendering for a week.

[plural]

This does basic response caching.

It doesn't appear to work for included resources, but will still be a bit helpful, so i'm pushing this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.26%. Comparing base (65f88e2) to head (e829b68).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #360   +/-   ##
=======================================
  Coverage   98.26%   98.26%           
=======================================
  Files          81       81           
  Lines        1385     1385           
  Branches      183      183           
=======================================
  Hits         1361     1361           
  Misses         24       24           

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