Update the release process (#845)
Update the release process (#845)

* Update the release process

- Add a task list to communicate the status of the release and reduce
the risks of mistakes.
- Remove the email to bazel-discuss, since it's sent automatically with
the blog post.
- Add a note about updating the release page.
- Serge is no longer doing reviews

* Mention pinning

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration