contributing: remove changesets (#10574)

We no longer use changesets to release our software.
The changesets still exist for unmaintained code.
Removing this from our contributing doc as the maintained
software does not use changesets. The releases are on github.

CONTRIBUTING.md

@@ -37,19 +37,6 @@ Once ready for review, make sure to include a thorough PR description to help re
 ### Response time:
 We aim to provide a meaningful response to all PRs and issues from external contributors within 2 business days.
 
-### Changesets
-
-We use [changesets](https://github.com/atlassian/changesets) to manage releases of our various packages.
-You *must* include a `changeset` file in your PR when making a change that would require a new package release.
-
-Adding a `changeset` file is easy:
-
-1. Navigate to the root of the monorepo.
-2. Run `pnpm changeset`. You'll be prompted to select packages to include in the changeset. Use the arrow keys to move the cursor up and down, hit the `spacebar` to select a package, and hit `enter` to confirm your selection. Select *all* packages that require a new release as a result of your PR.
-3. Once you hit `enter` you'll be prompted to decide whether your selected packages need a `major`, `minor`, or `patch` release. We follow the [Semantic Versioning](https://semver.org/) scheme. Please avoid using `major` releases for any packages that are still in version `0.y.z`.
-4. Commit your changeset and push it into your PR. The changeset bot will notice your changeset file and leave a little comment to this effect on GitHub.
-5. Voilà, c'est fini!
-
 ### Rebasing
 
 We use the `git rebase` command to keep our commit history tidy.