Move redir files and cleanup markdown files in root

[sdwheeler]

PR Summary

Move redir files and cleanup markdown files in root

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit c2b25df:

✅ Validation status: passed

File	Status	Preview URL	Details
.openpublishing.publish.config.json	✅Succeeded
.openpublishing.redirection.51.json	✅Succeeded	n/a (file deleted or renamed)
.openpublishing.redirection.72.json	✅Succeeded	n/a (file deleted or renamed)
.openpublishing.redirection.dsc.json	✅Succeeded	n/a (file deleted or renamed)
.openpublishing.redirection.gallery.json	✅Succeeded	n/a (file deleted or renamed)
.openpublishing.redirection.json	✅Succeeded	n/a (file deleted or renamed)
.openpublishing.redirection.psget.json	✅Succeeded	n/a (file deleted or renamed)
.openpublishing.redirection.virtual.json	✅Succeeded	n/a (file deleted or renamed)
.openpublishing.redirection.wmf.json	✅Succeeded	n/a (file deleted or renamed)
LICENSE	✅Succeeded	n/a (file deleted or renamed)
LICENSE-CODE	✅Succeeded	n/a (file deleted or renamed)
LICENSE-CODE.md	✅Succeeded
LICENSE.md	✅Succeeded
README.md	✅Succeeded
redir/.openpublishing.redirection.51.json	✅Succeeded	View (powershell-5.1)
redir/.openpublishing.redirection.72.json	✅Succeeded	View (powershell-7.2)
redir/.openpublishing.redirection.dsc.json	✅Succeeded	View (>=powershell-5.1)
redir/.openpublishing.redirection.gallery.json	✅Succeeded	View (>=powershell-5.1)
redir/.openpublishing.redirection.json	✅Succeeded	View (>=powershell-5.1)
redir/.openpublishing.redirection.psget.json	✅Succeeded
redir/.openpublishing.redirection.virtual.json	✅Succeeded	View
redir/.openpublishing.redirection.wmf.json	✅Succeeded	View (>=powershell-5.1)
SECURITY.md	✅Succeeded
ThirdPartyNotices	✅Succeeded	n/a (file deleted or renamed)
ThirdPartyNotices.md	✅Succeeded

For more details, please refer to the build report.

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