docs: add johnnyreilly as a contributor for ideas

[allcontributors]

Adds @johnnyreilly as a contributor for ideas.

This was requested by JoshuaKGoldberg in this comment

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Name	Status	Preview	Comments	Updated (UTC)
create	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 20, 2024 9:17pm

[JoshuaKGoldberg]

@johnnyreilly you'd definitely more than surpassed the bar for being credited for ideas prior to this, haha.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.30%. Comparing base (78bc44b) to head (56970a9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #78   +/-   ##
=======================================
  Coverage   94.30%   94.30%           
=======================================
  Files         128      128           
  Lines        3847     3847           
  Branches      570      570           
=======================================
  Hits         3628     3628           
  Misses        214      214           
  Partials        5        5           

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