use new, improved r-universe URL schema

[cjyetman]

https://ropensci.org/blog/2023/01/30/runiverse-permanent-urls/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.17%. Comparing base (54dfec8) to head (0e13f18).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #55   +/-   ##
=======================================
  Coverage   61.17%   61.17%           
=======================================
  Files          25       25           
  Lines         340      340           
=======================================
  Hits          208      208           
  Misses        132      132           

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