message: Remove reference to the welcome plugin
diff: @@ -384,11 +384,3 @@ A frontend plugin that provides a page where the user can tweak various
  settings.
  Stability: `1`
  -
  -### `welcome` [GitHub](https://github.com/backstage/backstage/tree/master/plugins/welcome/)
  -
  -A plugin that can be used to welcome the user to Backstage.
  -
  -Stability: `0`. This used to be the start page for the example app, but has been
  -replaced by the catalog plugin. It is still viewable at `/welcome` but may be
  -removed.
  