fix: undo overwriting of README.md attribution in updateLocalFiles

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🐛 Bug: "This package is based on" notice replaces create-typescript-app with --repository #750
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Adds a manual find-and-replace back in updateLocalFiles.

[codecov]

Codecov Report

Merging #844 (f98bb62) into main (09dbd39) will increase coverage by 0.01%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #844      +/-   ##
==========================================
+ Coverage   92.15%   92.16%   +0.01%     
==========================================
  Files          84       84              
  Lines        4221     4227       +6     
  Branches      262      262              
==========================================
+ Hits         3890     3896       +6     
  Misses        331      331              

Flag	Coverage Δ
create	71.83% <0.00%> (-0.11%)	⬇️
initialize	34.69% <100.00%> (+0.09%)	⬆️
migrate	73.29% <100.00%> (+0.03%)	⬆️
unit	52.56% <100.00%> (+0.06%)	⬆️

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Files Changed	Coverage Δ
src/steps/updateLocalFiles.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This is included in version v1.29.45 🎉

The release is available on:

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

Cheers! 📦🚀