* added button
* got URL params to carry through to service specific migrate pages
* do not display add mirror button if mirroring turned off
* added corrections by reviewers
* Add silverwind's suggestion
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: silverwind <me@silverwind.io>
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