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 (1c0f731) 10.97% compared to head (1399f70) 24.50%.
Report is 33 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #238       +/-   ##
===========================================
+ Coverage   10.97%   24.50%   +13.53%     
===========================================
  Files           6        8        +2     
  Lines         319      355       +36     
  Branches        8       12        +4     
===========================================
+ Hits           35       87       +52     
+ Misses        284      268       -16     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[JoshuaKGoldberg]

@all-contributors please add @JoshuaKGoldberg for maintenance.

🤖 Beep boop! This comment was added automatically by all-contributors-auto-action.
Not all contributions can be detected from Git & GitHub alone. Please comment any missing contribution types this bot missed.
...and of course, thank you for contributing! 💙