Update MTM usage documentation

[mikebell]

Background

Update the MTM tool usage information - https://github.com/ministryofjustice/cloud-platform-mtm

Add a link to the MTM readme on - https://runbooks.cloud-platform.service.justice.gov.uk/move-components-module.html

REF: https://mojdt.slack.com/archives/C514ETYJX/p1713782400978519

Proposed user journey

Approach

Which part of the user docs does this impact

Communicate changes

• post for #cloud-platform-update
• Weeknotes item
• Show the Thing/P&A All Hands/User CoP
• Announcements channel

Questions / Assumptions

Definition of done

• readme has been updated
• user docs have been updated
• another team member has reviewed
• smoke tests are green
• prepare demo for the team

Reference

How to write good user stories

[mikebell]

Updated both the mgirate module runbook and the mtm module readme with more information on how things work.