chore: simplify footer

Author: chriswblake

README.md

@@ -54,6 +54,4 @@ In this exercise, you will:
 
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+© 2025 GitHub • [Code of Conduct](https://www.contributor-covenant.org/version/2/1/code_of_conduct/code_of_conduct.md) • [MIT License](https://gh.io/mit)