docs: add joshuakgoldberg as a contributor for ideas

[allcontributors]

Adds @JoshuaKGoldberg as a contributor for ideas.

This was requested by JoshuaKGoldberg in this comment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9a3bd69) 65.78% compared to head (82b7189) 63.55%.
Report is 10 commits behind head on main.

❗ Current head 82b7189 differs from pull request most recent head c108259. Consider uploading reports for the commit c108259 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
- Coverage   65.78%   63.55%   -2.24%     
==========================================
  Files           6        6              
  Lines         114      107       -7     
  Branches       15       12       -3     
==========================================
- Hits           75       68       -7     
  Misses         39       39              

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