Remove rebasing section -- mostly covered in DM docs

CONTRIBUTING.md

@@ -43,14 +43,6 @@ These checks will:
 
 The checks will rerun anytime the PR branch is updated.
 
-Rebasing
---------
-
-If a pull request shows the message "This branch is out-of-date with the base branch", then the "Update with rebase" button should be selected and pressed on the right to update it.
-The "Update branch" selection should not be used, as it will perform a merge, which is undesirable behavior that will cause the rebase check to fail.
-
-Rebasing can also be accomplished using a command like `git rebase -i main` locally after updating `main` and then force pushing the rebased branch using `git push -f`.
-
 Schema Versioning Overview
 --------------------------