docs: mention favorite emoji at bottom of CONTRIBUTING.md

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 📝 Documentation: Add a "No Brown M&Ms" equivalent to CONTRIBUTING.md #575
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Per the issue, asks for a favorite emoji.

[codecov]

Codecov Report

Merging #591 (1500144) into main (566cf61) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #591      +/-   ##
==========================================
+ Coverage   88.29%   88.31%   +0.02%     
==========================================
  Files          61       61              
  Lines        3127     3133       +6     
  Branches      129      129              
==========================================
+ Hits         2761     2767       +6     
  Misses        362      362              
  Partials        4        4              

Flag	Coverage Δ
hydrate	77.81% <100.00%> (+0.04%)	⬆️
setup	70.79% <ø> (ø)
unit	48.80% <ø> (ø)

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Impacted Files	Coverage Δ
...rate/steps/writing/creation/dotGitHub/rootFiles.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This is included in version v1.28.41 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀