PLATEXP-2689: Remove Rackspace Manage 365 Login image

[ssalinas24]

Jira: https://rackspace.atlassian.net/browse/PLATEXP-2689

• Removes the specific image from the doc https://docs.rackspace.com/support/how-to/how-to-set-up-O365-via-your-cloud-office-control-panel
• Also deletes the image file from our docs site

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