This Doc issue is to remove any reference to the classic overview page, the fleet view toggle, and the deprecation notice for the classic overview layout.
The Overview will look as the screen capture attached highlights. There is no toggle anymore and all deprecation warnings have been removed.

1. - [x] Mandatory: Add the required version to the Fix version/s field.
2.13

2. - [ ] Mandatory: Choose the type of documentation change or review.

• [x] We need to update to an existing topic

• [ ] We need to add a new document to an existing section

3. - [ ] *Mandatory: *Use the following link to open the doc and find where the
documentation update should go.

https://github.com/stolostron/rhacm-docs/blob/2.12_stage/console/console.adoc
https://github.com/stolostron/rhacm-docs/tree/2.12_stage/release_notes

4. - [ ] Mandatory for GA content:

• [ ] Add steps, the diff, known issue, and/or other important
  conceptual information in the following space:
  In 2.12 we deprecated the "classic" overview page. Now in 2.13 we are officially removing the classic layout from the ACM product. This makes the Fleet view layout the only overview page now. there will no longer be a switch/toggle for classic & fleet view.

• [ ] *Add Required access level for the user to complete the task: any user

• [ ] Add verification at the end of the task, how does the user
  verify success.
  They should be able to navigate to the overview page and only see the fleet view layout.

• [ ] Add link to dev story here:
  https://issues.redhat.com/browse/ACM-14872