docs: add rubiesonthesky as a contributor for ideas

[allcontributors]

Adds @rubiesonthesky 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.
✅ Project coverage is 74.22%. Comparing base (65a0e2b) to head (40da1ca).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2508   +/-   ##
=======================================
  Coverage   74.22%   74.22%           
=======================================
  Files         169      169           
  Lines        2875     2875           
  Branches      721      721           
=======================================
  Hits         2134     2134           
  Misses        508      508           
  Partials      233      233           

Flag	Coverage Δ
mutation	66.81% <ø> (ø)
unit	20.93% <ø> (ø)

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