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 18.82%. Comparing base (795c275) to head (8393bd5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   18.82%   18.82%           
=======================================
  Files          35       35           
  Lines        1126     1126           
=======================================
  Hits          212      212           
  Misses        914      914           

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