add copyright and discussion links

.github/steps/X-finish.md

@@ -19,7 +19,7 @@ Here's a recap of all the tasks you've accomplished in your repository:
 
 - The Docs on [Removing sensitive data](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/removing-sensitive-data-from-a-repository) are comprehensive and recommended reading after this course.
 - Try your hand at some of the other features listed in the [BFG Repo-Cleaner documentation](https://rtyley.github.io/bfg-repo-cleaner/).
-- [We'd love to hear what you thought of this course](TBD-feedback-link).
+- [We'd love to hear what you thought of this course](https://github.com/orgs/skills/discussions/categories/change-commit-history).
 - [Take another GitHub Skills course](https://github.com/skills).
 - [Read the GitHub Getting Started docs](https://docs.github.com/en/get-started).
 - To find projects to contribute to, check out [GitHub Explore](https://github.com/explore).

README.md

@@ -68,8 +68,8 @@ In this course, you will:
 
 ---
 
-Get help: [TBD-support](TBD-support-link) • [Review the GitHub status page](https://www.githubstatus.com/)
+Get help: [Post in our discussion board](https://github.com/orgs/skills/discussions/categories/change-commit-history) • [Review the GitHub status page](https://www.githubstatus.com/)
 
-© 2023 TBD-copyright-holder • [Code of Conduct](https://www.contributor-covenant.org/version/2/1/code_of_conduct/code_of_conduct.md) • [MIT License](https://gh.io/mit)
+© 2024 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)
 
 </footer>