Revert CodeCommit backup mirror

README.md

@@ -17,7 +17,6 @@ All future user interfaces at Topcoder will be implemented here. Pre-existing us
 # Source Control & CI/CD
 
 - [Deployments](#deployments)
-- [Repository Backup](#repository-backup)
 - [Pull Requests](#pull-requests)
 - [Branching](#branching)
 - [Commits](#commits)
@@ -30,10 +29,6 @@ The `dev` branch is auto-deployed to the dev environment: https://platform-mvp.t
 
 The `master` branch is auto-deployed to the production environment: https://platform-ui.topcoder.com.
 
-## Repository Backup
-
-Git branches, tags, and their reachable history can be mirrored from GitHub to AWS CodeCommit by the `Mirror GitHub to AWS CodeCommit` workflow. See the [CodeCommit mirror setup and operations guide](docs/github-codecommit-mirror.md) for its behavior, limitations, and the one-time AWS and GitHub administrator setup.
-
 ## Pull Requests
 
 If a Jira ticket requires any code changes, it should have its own pull request.