Removing stale content from "Editing the Handbook" page.

### Web IDE steps to create a new MR

1. Navigate to the handbook page you want to edit. At the bottom, or on the right, click on the URL `Edit this page` to open the new Web IDE.

   - Alternatively, open the [public handbook](https://gitlab.com/gitlab-com/content-sites/handbook) project and select `Web IDE` from the edit actions. This requires you to navigate into the source tree where the handbook files are located.

   ![Handbook page at the bottom, action: Edit in Web IDE](/images/handbook/about/editing-handbook/practical_handbook_edits_web_ide_vs_code_bottom_handbook_action.png)

1. Familiarize yourself with the [Web IDE](https://docs.gitlab.com/ee/user/project/web_ide/):

   - The menu sections are located on the left